Runtime TileData modifications are discarded after reparenting

[KoBeWi]

Tested versions

4.3 dev3
4.3 1aab6e9
Does not happen in 4.2.1

System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

Issue description

When TileMap is reparented, the modifications from _tile_data_runtime_update() are discarded, but the method is not called again. Here I'm reparenting the TileMap and the method that disables collisions don't run:

godot_B2f0Mwo5KT.mp4

Steps to reproduce

1. Use _tile_data_runtime_update() to change something
2. Reparent the TileMap
3. Notice that your changes are gone

Minimal reproduction project (MRP)

TileMapBug.tscn.txt

[matheusmdx]

Bisecting points to #87115 as culprit:

[groud]

Tested with latest master, I cannot reproduce the bug with the provided MRP.
Could you confirm it is fixed on master?