[Godot 4 beta 3] Impossible to subclass TileMap with c++

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[Godot 4 beta 3] Impossible to subclass TileMap with c++

Sox

Hi, I'm, trying to create my custom TileMap class using GDExtension. everything seems to work well except that when I try to add a tileset to the tile map it always returns to me that the tile set is corrupted.
Even if I create an empty class just the fact of subclassing a TileMap invalidates the tile set.
the error is this one:

ERROR: Corrupted tile data.
   at: (scene/2d/tile_map.cpp:2744)

thank you