### 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)

r_ret = terrain_peering_bits[i];
					return true;
				}
			}
			return false;
		} else if (components.size() == 2 && components[0].begins_with("navigation_layer_") && components[0].trim_prefix("navigation_layer_").is_valid_int()) {
			
			int layer_index = components[0].trim_prefix("navigation_layer_").to_int();
			ERR_FAIL_COND_V(layer_index < 0, false);
			if (layer_index >= navigation.size()) {
				return false;
			}
			if (components[1] == "polygon") {
				r_ret = get_navigation_polygon(layer_index);
				return true;
			}
		} else if (components.size() == 1 && components[0].begins_with("custom_data_") && components[0].trim_prefix("custom_data_").is_valid_int()) {
			
			int layer_index = components[0].trim_prefix("custom_data_").to_int();
			ERR_FAIL_COND_V(layer_index < 0, false);
			if (layer_index >= custom_data.size()) {
				return false;
			}
			r_ret = get_custom_data_by_layer_id(layer_index);
			return true;
		}
	}
	return false;
}
void TileData::_get_property_list(List<PropertyInfo> *p_list) const {