diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 609953660..0512c9031 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -168,6 +168,14 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      # THE RELEASE TAGS, FOR native_upgrade_converge'S FIXTURE ARMS (#1341). Each
+      # released fixture must be byte-identical to what its tag shipped, compared by
+      # blob id against `v<version>:pgcolumnar--<version>.sql`. actions/checkout
+      # fetches no tags, so these arms used to skip on every CI run. Depth 1 is
+      # enough: only the file at each tagged commit is read.
+      - name: fetch the release tags, for the fixture-blob comparisons
+        run: git fetch --depth=1 origin '+refs/tags/v1.0-alpha*:refs/tags/v1.0-alpha*'
+
       - name: Add the PGDG repository and install PostgreSQL ${{ matrix.pg }} with its headers
         run: |
           set -euo pipefail
@@ -557,6 +565,14 @@ jobs:
           git fetch --depth=1 origin \
             "+refs/heads/${{ github.base_ref }}:refs/remotes/origin/${{ github.base_ref }}"
 
+      # THE RELEASE TAGS, FOR native_upgrade_converge'S FIXTURE ARMS (#1341). Each
+      # released fixture must be byte-identical to what its tag shipped, compared by
+      # blob id against `v<version>:pgcolumnar--<version>.sql`. actions/checkout
+      # fetches no tags, so these arms used to skip on every CI run. Depth 1 is
+      # enough: only the file at each tagged commit is read.
+      - name: fetch the release tags, for the fixture-blob comparisons
+        run: git fetch --depth=1 origin '+refs/tags/v1.0-alpha*:refs/tags/v1.0-alpha*'
+
       # The repository and the package lists first, on their own, because the
       # cache key below is derived from the versions apt resolves and cannot be
       # computed before the lists exist.
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 02c8b54b4..3d48bdca2 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -90,6 +90,15 @@ jobs:
         with:
           fetch-depth: 2
 
+      # THE RELEASE TAGS, FOR native_upgrade_converge'S FIXTURE ARMS (#1341). Each
+      # released fixture must be byte-identical to what its tag shipped, compared by
+      # blob id against `v<version>:pgcolumnar--<version>.sql`. actions/checkout
+      # fetches no tags, so these arms used to skip on every CI run. Depth 1 is
+      # enough: only the file at each tagged commit is read, and it leaves the
+      # checkout's own history as it was (HEAD~1 still resolves at fetch-depth 2).
+      - name: fetch the release tags, for the fixture-blob comparisons
+        run: git fetch --depth=1 origin '+refs/tags/v1.0-alpha*:refs/tags/v1.0-alpha*'
+
       # The packages are ~102 MB, of which ~91 MB is the LLVM toolchain that
       # postgresql-server-dev-N depends on. That download is what stalls: every
       # failure of this step sat at the 600s bound while every success finished
@@ -727,6 +736,15 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      # THE RELEASE TAGS, FOR native_upgrade_converge'S FIXTURE ARMS (#1341). Each
+      # released fixture must be byte-identical to what its tag shipped, compared by
+      # blob id against `v<version>:pgcolumnar--<version>.sql`. actions/checkout
+      # fetches no tags, so these arms used to skip on every CI run. Depth 1 is
+      # enough: only the file at each tagged commit is read, and it leaves the
+      # checkout's own history as it was (HEAD~1 still resolves at fetch-depth 2).
+      - name: fetch the release tags, for the fixture-blob comparisons
+        run: git fetch --depth=1 origin '+refs/tags/v1.0-alpha*:refs/tags/v1.0-alpha*'
+
       - name: Add the PGDG repository and install PostgreSQL ${{ matrix.pg }} with its headers
         run: |
           set -euo pipefail
diff --git a/test/native_upgrade_converge.sh b/test/native_upgrade_converge.sh
index 454900137..78b4b1443 100755
--- a/test/native_upgrade_converge.sh
+++ b/test/native_upgrade_converge.sh
@@ -219,23 +219,26 @@ _fx_git() { git -C "$HERE/.." "$@" 2>/dev/null; }
 if ! _fx_git rev-parse --git-dir >/dev/null; then
 	_fx_why="no git repository in the tree under test"
 elif [ -z "$(_fx_git tag -l 'v1.0-alpha*')" ]; then
-	# CI checks out at depth 1 with no tags, so this cannot run there. It runs
-	# locally and in the five-major release gate, which is where a fixture is
-	# captured and therefore where it can be captured wrongly.
+	# actions/checkout fetches no tags, so CI fetches the release tags in a step
+	# of its own for these arms (#1341). A local checkout without them still
+	# lands here, and the arms skip rather than compare against nothing.
 	_fx_why="no release tags in this checkout"
 else
 	_fx_why=""
 fi
 
+# The name is written out in each call rather than held in a variable: the twin
+# grader reads a check's name from the call, and `check "$_fx_name"` was invisible
+# to it, so a port could drop this arm and still grade complete.
 for v in $_FX_TAGGED; do
-	_fx_name="the $v fixture is byte-identical to what v$v shipped"
 	if [ -n "$_fx_why" ]; then
-		check_skip "$_fx_name" "SKIP  $_fx_name ($_fx_why)" "$_fx_why"
+		check_skip "the $v fixture is byte-identical to what v$v shipped" \
+			"SKIP  the $v fixture is byte-identical to what v$v shipped ($_fx_why)" "$_fx_why"
 		continue
 	fi
 	_fx_tag="$(_fx_git rev-parse "v$v:pgcolumnar--$v.sql" || echo "no such path at v$v")"
 	_fx_fix="$(_fx_git hash-object "$HERE/fixtures/pgcolumnar--$v.sql" || echo "fixture missing")"
-	check "$_fx_name" "$_fx_fix" "$_fx_tag"
+	check "the $v fixture is byte-identical to what v$v shipped" "$_fx_fix" "$_fx_tag"
 done
 
 # THE ARM THAT CATCHES THE QUIET HALF. Staging unconditionally fixes it; this
diff --git a/test/pytest/TESTS.md b/test/pytest/TESTS.md
index ab5ab84d8..ae1bcf83f 100644
--- a/test/pytest/TESTS.md
+++ b/test/pytest/TESTS.md
@@ -7531,7 +7531,7 @@ Part of the pytest twin of `test/drop_cleanup.sh` (#1265, ported for #1341): its
 
 ## 143. test_native_upgrade_converge.py: every release upgrades to a fresh catalog, and the window before it
 
-The pytest twin of `test/native_upgrade_converge.sh` (#1341), by the shell's names, except its release-tag checks, so the pair is declared INCOMPLETE. `ALTER EXTENSION pgcolumnar UPDATE` must bring a database on any released version to a catalog identical to a fresh install of the current `default_version`: every function's definition, ACL and comment, and every relation, column, type and foreign-data wrapper. The released starting points are the install scripts in `test/fixtures`. They are staged into the extension directory once for the module, under a lock that makes a second stager wait, and whatever was there is put back after. A backup already there means an earlier run died, so it holds the original and is kept.
+The pytest twin of `test/native_upgrade_converge.sh` (#1341), every check by the shell's name, so the pair is declared COMPLETE. `ALTER EXTENSION pgcolumnar UPDATE` must bring a database on any released version to a catalog identical to a fresh install of the current `default_version`: every function's definition, ACL and comment, and every relation, column, type and foreign-data wrapper. The released starting points are the install scripts in `test/fixtures`. They are staged into the extension directory once for the module, under a lock that makes a second stager wait, and whatever was there is put back after. A backup already there means an earlier run died, so it holds the original and is kept.
 
 Between installing a new library and running the update, a database runs the new library over its previous release's catalog (#1341 item 66). Reads and writes must work there. `DROP TABLE`, `TRUNCATE` and `pgcolumnar.vacuum()` need a catalog table the old one lacks, so they must be refused with 42P01, change nothing, and carry a hint naming the update. After the update all three succeed on the same rows.
 
@@ -7544,6 +7544,8 @@ Between installing a new library and running the update, a database runs the new
 | `test_the_staged_fixtures_are_the_committed_ones` | the control's `default_version`; no backup was already staged; every fixture was staged, and each staged script is the committed fixture |
 | `test_each_release_upgrades_to_a_fresh_catalog` | parametrized by the four fixtures: a fresh install of the target has more than 100 objects to compare, the upgrade applies, the extension is at the target, and its catalog equals the fresh install's |
 | `test_the_upgrade_window` | at the previous catalog: rows written, deleted and read; the three operations refused with the hint and nothing changed; after the update the rows are intact and all three succeed |
+| `test_the_fixture_sweep_found_fixtures` | the fixtures on disk, less the synthetic `1.0-alpha`, are not an empty list: an empty sweep would compare nothing and report clean |
+| `test_each_fixture_is_what_its_tag_shipped` | parametrized by those fixtures: each one's blob id equals `v<version>:pgcolumnar--<version>.sql`'s; with no git repository or no release tags it cannot run (UNMET_PRECONDITION) rather than pass. CI fetches the tags for it |
 
 ## 144. test_fk_referencing.py: a foreign key referencing a columnar table is refused where it is chosen
 
diff --git a/test/pytest/expected_tests.txt b/test/pytest/expected_tests.txt
index 6b01c6e7c..71063c813 100644
--- a/test/pytest/expected_tests.txt
+++ b/test/pytest/expected_tests.txt
@@ -858,4 +858,6 @@ guard_tests 442
 # tests, one per check, by collection over the cluster files.
 # cluster_tests 1018 -> 1025 for #1341, test_native_upgrade_converge.py ported by name except its
 # release-tag arms (1 -> 8 tests), by collection over the cluster files.
-cluster_tests 1025
+# cluster_tests 1025 -> 1029 for #1341, test_native_upgrade_converge.py's release-tag arms (the
+# fixture sweep premise and one test per tagged fixture: 1 + 3), by collection over the cluster files.
+cluster_tests 1029
diff --git a/test/pytest/test_compare_to_bash.py b/test/pytest/test_compare_to_bash.py
index 88f4f7038..22634568d 100644
--- a/test/pytest/test_compare_to_bash.py
+++ b/test/pytest/test_compare_to_bash.py
@@ -168,6 +168,7 @@
             "native_skip",
             "native_toasted_write",
             "native_truncate",
+            "native_upgrade_converge",
             "native_vacuum_race",
             "native_varlena_bound",
             "native_vecskip",
@@ -226,12 +227,6 @@
 # about the PORT rather than a licence: the standing arm does not grade it, so the
 # reason is the only thing standing between a declared gap and a forgotten one.
 INCOMPLETE = {
-    # #1341 ported every arm but the release-tag ones: each tagged fixture is
-    # byte-identical to what its tag shipped. CI checks out without tags, so the shell
-    # skips them there with check_skip, and this layer has no verdict for an arm that
-    # runs on one checkout and not another.
-    "native_upgrade_converge": "every arm is ported except the release-tag sweep and "
-                               "the per-tag fixture-blob comparisons",
     # #1341 item 29 ported the arms four fixes added with shell arms only. Each
     # pair below holds that fix's arms and nothing else of its shell suite.
     "inheritance": "the #1259 arms (a partitioned columnar parent is refused with "
diff --git a/test/pytest/test_native_upgrade_converge.py b/test/pytest/test_native_upgrade_converge.py
index d1f220b17..4c2276325 100644
--- a/test/pytest/test_native_upgrade_converge.py
+++ b/test/pytest/test_native_upgrade_converge.py
@@ -306,6 +306,46 @@ def test_the_staged_fixtures_are_the_committed_ones(staging, expect):
                 "every staged install script is the committed fixture, not a leftover")
 
 
+# The fixtures to compare against their tags, derived from the fixtures on disk as
+# the shell derives them, so a fixture added at the next cycle-open is checked
+# without anyone listing it. 1.0-alpha is synthetic: v1.0-alpha shipped
+# pgcolumnar--1.0-dev.sql, so no tag holds a pgcolumnar--1.0-alpha.sql.
+TAGGED = sorted(p.name[len("pgcolumnar--"):-len(".sql")] for p in FIXTURES.glob("pgcolumnar--*.sql")
+                if p.name != "pgcolumnar--1.0-alpha.sql")
+
+
+def _git(*args):
+    """-> git's stripped stdout in the repository under test, or None when it fails."""
+    r = subprocess.run(["git", "-C", str(REPO), *args], capture_output=True, text=True)
+    return r.stdout.strip() if r.returncode == 0 else None
+
+
+def test_the_fixture_sweep_found_fixtures(expect):
+    # An empty sweep would leave nothing below to compare and report clean.
+    expect.text("yes" if TAGGED else "no", "yes",
+                "premise: the fixture sweep found fixtures to compare against their tags")
+
+
+@pytest.mark.parametrize("v", TAGGED)
+def test_each_fixture_is_what_its_tag_shipped(v, expect):
+    """Blob ids, not a diff: a blob id is a lookup that no similarity heuristic can
+    distort. The local tag is trusted, as in the shell; if this fails and the fixture
+    looks right, check the tag with `git ls-remote origin refs/tags/v<version>`."""
+    if _git("rev-parse", "--git-dir") is None:
+        why = "no git repository in the tree under test"
+    elif not _git("tag", "-l", "v1.0-alpha*"):
+        why = "no release tags in this checkout"
+    else:
+        why = ""
+    if why:
+        expect.cannot_run("UNMET_PRECONDITION", why,
+                          name=f"the {v} fixture is byte-identical to what v{v} shipped")
+        return
+    tag = _git("rev-parse", f"v{v}:pgcolumnar--{v}.sql") or query_error(f"no such path at v{v}")
+    fixture = _git("hash-object", str(FIXTURES / f"pgcolumnar--{v}.sql")) or query_error("fixture missing")
+    expect.text(fixture, tag, f"the {v} fixture is byte-identical to what v{v} shipped")
+
+
 @pytest.mark.parametrize("from_", VERSIONS)
 def test_each_release_upgrades_to_a_fresh_catalog(pgc_cluster, staging, reference, from_, expect):
     extdir, _, _ = staging