Conversion between V3 and V4 loses tilemap tile sizes and layer order

[Proggle]

Godot version

v3.5.stable.official [991bb6a], v4.0.beta2.official [f8745f2]

System information

Windows 10

Issue description

Tilesizes and layer order get changed in godot 4 when importing from godot 3

Godot 3: tilesize is (correctly) 18x18, icon is in front of tileset, covering the ! blocks.

Godot 4: tile size has been changed from 18x18 to 16x16, icon is now behind tileset

There's supposed to be some kind of legacy mode per #64006 but it doesn't seem to work out of the box.

Steps to reproduce

Create a tile map in Godot 3. Convert to Godot 4. Layer order and tile sizes get changed.

Minimal reproduction project

tilesizeConversion.zip

[Calinou]

I can confirm this on 4.0.beta 0c23a2c while porting demos: godotengine/godot-demo-projects#782

[Calinou]

Closing in favor of #70784, which contains more information about the issue at hand.