The FileSystem dock highlights the main scene, but doesn't update if the main scene changes

[Zylann]

Godot 3.2.1

Following this QA post:
I just realized the FileSystem dock highlights the main scene with a blue color (by default). However, it doesn't update when I change that scene.
Forcing a rebuild of the tree (by changing its layout or restarting the editor) makes it update.

On a side note, I'm wondering what benefit there is to do something like that. It seems quite peculiar, and not immediately obvious.

[dreamsComeTrue]

Master branch doesn't have that issue. 'Saving the scene' action triggers refresh of that UI and change with blue highlight