### 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)

Ref<TileSet> tileset = tile_map_node->get_tileset();
	ERR_FAIL_COND_MSG(tileset.is_null(), "Cannot call fix_invalid_tiles() on a TileMap without a valid TileSet.");
	RBSet<Vector2i> coords;
	for (const KeyValue<Vector2i, CellData> &E : tile_map) {
		TileSetSource *source = *tileset->get_source(E.value.cell.source_id);
		if (!source || !source->has_tile(E.value.cell.get_atlas_coords()) || !source->has_alternative_tile(E.value.cell.get_atlas_coords(), E.value.cell.alternative_tile)) {
			coords.insert(E.key);
		}
	}
	for (const Vector2i &E : coords) {
		set_cell(E, TileSet::INVALID_SOURCE, TileSetSource::INVALID_ATLAS_COORDS, TileSetSource::INVALID_TILE_ALTERNATIVE);
	}
}
bool TileMapLayer::has_body_rid(RID p_physics_body) const {
	return bodies_coords.has(p_physics_body);
}
Vector2i TileMapLayer::get_coords_for_body_rid(RID p_physics_body) const {
	return bodies_coords[p_physics_body];
}
TileMapLayer::~TileMapLayer() {
	if (!tile_map_node) {
		
		return;
	}
	in_destructor = true;
	clear();
	internal_update();
}
HashMap<Vector2i, TileSet::CellNeighbor> TerrainConstraint::get_overlapping_coords_and_peering_bits() const {