Timeline toolbar is not displayed if file is saved in a certain directory (???)

[FelipeDefensor]

The timeline toolbar for PDF timelines is not displayed when opening a file located at C:/Users/Felipe/Documents/tilia/testing/pdf-tl-test.tla with the contents below:

{
  "file_path": "C:/Users/Felipe/Documents/tilia/testing/pdf-tl-test.tla",
  "media_path": "",
  "media_metadata": {
    "title": "pdf-tl-test",
    "notes": "",
    "composer": "",
    "tonality": "",
    "time signature": "",
    "performer": "",
    "performance year": "",
    "arranger": "",
    "composition year": "",
    "recording year": "",
    "form": "",
    "instrumentation": "",
    "genre": "",
    "lyrics": "",
    "media length": 60.0
  },
  "timelines": {
    "0": {
      "is_visible": true,
      "ordinal": 1,
      "height": 40,
      "kind": "SLIDER_TIMELINE",
      "components": {},
      "components_hash": "",
      "hash": ""
    },
    "1": {
      "kind": "PDF_TIMELINE",
      "height": 30,
      "is_visible": true,
      "name": "",
      "ordinal": 2,
      "path": "C:/Users/Felipe/Documents/pesquisa/doutorado/conteudo/pdfs/cartola-01.pdf",
      "hash": "b72b9eba874bce035acbcc6175706c3d",
      "components": {
        "3": {
          "time": 0,
          "page_number": 1,
          "kind": "PDF_MARKER",
          "hash": "9b0fd3b850698317bef57fa6e71a38ba"
        }
      },
      "components_hash": "3d573ae4b40a4215574ad138be8aba27"
    }
  },
  "timelines_hash": "bd6aecd7a0aa840869056658c888febf",
  "app_name": "TiLiA",
  "version": "0.5.15"
}

Very weirdly, if I place the same file in C:\Users\Felipe\Desktop the toolbar is displayed.

This seems to only happen in the refactor-timelines-request branch.