Adding TileMap layer switches to TileSet editor

[KoBeWi]

Godot version

86dd3f3

System information

Windows 10 x64

Issue description

It appeared recently.

EDIT:
Also happens when removing.

EDIT2:
Probably related, but when you just opened the project and select a TileMap, the TileSet tab is active.

Steps to reproduce

1. Add TileMap
2. Edit it
3. Add layer
4. You are now editing TileSet

Minimal reproduction project

No response

[KoBeWi]

This regressed between alpha 13 and 14. I tried to bisect it, but there were a couple of commits where the TileMap was crashing the editor and the bisect failed to give usable results.

[KoBeWi]

Regression from #58361 lol
CC @SaracenOne