### Tested versions

- First reproducible in: v4.2.dev5.official [e3e2528ba]
- Reproducible in: v4.2.stable.official [46dc27791], v4.2.dev5.official [e3e2528ba], v4.2.dev6.official [57a6813bb]
- Not reproducible in: v4.1.3.stable.official [f06b6836a], v4.2.dev1.official [0c2144da9], v4.2.dev2.official [da81ca62a], v4.2.dev3.official [013e8e3af], v4.2.dev4.official [549fcce5f]

### System information

Godot v4.2.stable - Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1080 (NVIDIA; 31.0.15.4617) - Intel(R) Core(TM) i5-8600K CPU @ 3.60GHz (6 Threads)

### Issue description

The `TileSet` `set_occlusion_layer_light_mask` method does not properly update the `TileSet`'s light mask, causing shadows to still be cast by the `TileSet` even when the light mask is changed using the method to a mask different from a given light source (or even an empty light mask). In v4.1.3.stable.official [f06b6836a] this method was working properly.

### Steps to reproduce

- Download and open the `MRPSetOcclusionLayerTileSet_4.2-stable` project folder using one of the reproducible Godot versions noted above.
- Run the project, and press the spacebar key. This will toggle the occlusion layer light mask value of the on-screen `TileMap`'s `TileSet` occlusion light mask between 0 and 1. You will see that the `TileMap` still casts shadows regardless of the new value of its `TileSets`'s occlusion layer light mask.

### Minimal reproduction project (MRP)

[MRPSetOcclusionLayerTileSetBug.zip](https://github.com/godotengine/godot/files/13592741/MRPSetOcclusionLayerTileSetBug.zip)

const Ref<TileSet> &tile_set = tile_map_node->get_tileset();
	TileMapCell &c = r_cell_data.cell;
	TileSetSource *source;
	if (tile_set->has_source(c.source_id)) {
		source = *tile_set->get_source(c.source_id);
		if (source->has_tile(c.get_atlas_coords()) && source->has_alternative_tile(c.get_atlas_coords(), c.alternative_tile)) {
			TileSetAtlasSource *atlas_source = Object::cast_to<TileSetAtlasSource>(source);
			if (atlas_source) {
				bool ret = false;
				if (tile_map_node->GDVIRTUAL_CALL(_use_tile_data_runtime_update, layer_index_in_tile_map_node, r_cell_data.coords, ret) && ret) {
					TileData *tile_data = atlas_source->get_tile_data(c.get_atlas_coords(), c.alternative_tile);
					
					TileData *tile_data_runtime_use = tile_data->duplicate();
					tile_data_runtime_use->set_allow_transform(true);
					r_cell_data.runtime_tile_data_cache = tile_data_runtime_use;
					tile_map_node->GDVIRTUAL_CALL(_tile_data_runtime_update, layer_index_in_tile_map_node, r_cell_data.coords, tile_data_runtime_use);
					if (p_auto_add_to_dirty_list) {
						dirty.cell_list.add(&r_cell_data.dirty_list_element);
					}
				}
			}
		}
	}
}
void TileMapLayer::_clear_runtime_update_tile_data() {