### Godot version

4.01

### System information

Windows 10

### Issue description

It seems a tiles Custom Data is cleared/not set when "Local to Scene" is enabled for the TileMap in the Resource section. At least the custom data isn't set by the time of the _ready function in the script attached to the TileMap.

### Steps to reproduce

create TileMap and tileset with custom data and attached script. in _ready method attempt to read custom data from a used cell. 

In Attached project run it. It will print_debug if it found custom data or not. "Local to Scene" is enabled so it will not find the custom data.

### Minimal reproduction project

[TileMapCustomDataLocalBugReproduce.zip](https://github.com/godotengine/godot/files/11470771/TileMapCustomDataLocalBugReproduce.zip)

Vector<String> components = String(p_name).split("/", true, 2);
	if (components.size() >= 2 && components[0] == "scenes" && components[1].is_valid_int() && scenes.has(components[1].to_int())) {
		if (components.size() >= 3 && components[2] == "scene") {
			r_ret = scenes[components[1].to_int()].scene;
			return true;
		} else if (components.size() >= 3 && components[2] == "display_placeholder") {
			r_ret = scenes[components[1].to_int()].scene;
			return true;
		}
	}
	return false;
}
void TileSetScenesCollectionSource::_get_property_list(List<PropertyInfo> *p_list) const {