The new Layout panel is the only official inspector panel that does not wrap a *.Slot render prop, and a repo-wide search confirms that no Layout Slot/Fill component exists. As a result, third-party block extensions cannot place layout-related controls in the designated panel and must misuse another panel or append them outside the panel structure. Add a Layout Slot/Fill alongside the existing ItemSelection and DisplayOptions extension points.
The new Layout panel is the only official inspector panel that does not wrap a *.Slot render prop, and a repo-wide search confirms that no Layout Slot/Fill component exists. As a result, third-party block extensions cannot place layout-related controls in the designated panel and must misuse another panel or append them outside the panel structure. Add a Layout Slot/Fill alongside the existing ItemSelection and DisplayOptions extension points.