### 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)

HashMap<Vector2i, TileSet::TerrainsPattern> err_value;
	TILEMAP_CALL_FOR_LAYER_V(p_layer, err_value, terrain_fill_connect, p_coords_array, p_terrain_set, p_terrain, p_ignore_empty_terrains);
}
HashMap<Vector2i, TileSet::TerrainsPattern> TileMap::terrain_fill_path(int p_layer, const Vector<Vector2i> &p_coords_array, int p_terrain_set, int p_terrain, bool p_ignore_empty_terrains) {
	HashMap<Vector2i, TileSet::TerrainsPattern> err_value;
	TILEMAP_CALL_FOR_LAYER_V(p_layer, err_value, terrain_fill_path, p_coords_array, p_terrain_set, p_terrain, p_ignore_empty_terrains);
}
HashMap<Vector2i, TileSet::TerrainsPattern> TileMap::terrain_fill_pattern(int p_layer, const Vector<Vector2i> &p_coords_array, int p_terrain_set, TileSet::TerrainsPattern p_terrains_pattern, bool p_ignore_empty_terrains) {
	HashMap<Vector2i, TileSet::TerrainsPattern> err_value;
	TILEMAP_CALL_FOR_LAYER_V(p_layer, err_value, terrain_fill_pattern, p_coords_array, p_terrain_set, p_terrains_pattern, p_ignore_empty_terrains);
}
void TileMap::set_cells_terrain_connect(int p_layer, TypedArray<Vector2i> p_cells, int p_terrain_set, int p_terrain, bool p_ignore_empty_terrains) {
	TILEMAP_CALL_FOR_LAYER(p_layer, set_cells_terrain_connect, p_cells, p_terrain_set, p_terrain, p_ignore_empty_terrains);
}
void TileMap::set_cells_terrain_path(int p_layer, TypedArray<Vector2i> p_path, int p_terrain_set, int p_terrain, bool p_ignore_empty_terrains) {
	TILEMAP_CALL_FOR_LAYER(p_layer, set_cells_terrain_path, p_path, p_terrain_set, p_terrain, p_ignore_empty_terrains);
}
TileMapCell TileMap::get_cell(int p_layer, const Vector2i &p_coords, bool p_use_proxies) const {
	TILEMAP_CALL_FOR_LAYER_V(p_layer, TileMapCell(), get_cell, p_coords, p_use_proxies);
}
Vector2i TileMap::get_coords_for_body_rid(RID p_physics_body) {
	for (const Ref<TileMapLayer> &layer : layers) {
		if (layer->has_body_rid(p_physics_body)) {
			return layer->get_coords_for_body_rid(p_physics_body);
		}
	}
	ERR_FAIL_V_MSG(Vector2i(), vformat("No tiles for the given body RID %d.", p_physics_body.get_id()));
}
int TileMap::get_layer_for_body_rid(RID p_physics_body) {