### 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)

TILEMAP_CALL_FOR_LAYER(p_layer, set_cell, p_coords, p_source_id, p_atlas_coords, p_alternative_tile);
}
void TileMap::erase_cell(int p_layer, const Vector2i &p_coords) {
	TILEMAP_CALL_FOR_LAYER(p_layer, set_cell, p_coords, TileSet::INVALID_SOURCE, TileSetSource::INVALID_ATLAS_COORDS, TileSetSource::INVALID_TILE_ALTERNATIVE);
}
int TileMap::get_cell_source_id(int p_layer, const Vector2i &p_coords, bool p_use_proxies) const {
	TILEMAP_CALL_FOR_LAYER_V(p_layer, TileSet::INVALID_SOURCE, get_cell_source_id, p_coords, p_use_proxies);
}
Vector2i TileMap::get_cell_atlas_coords(int p_layer, const Vector2i &p_coords, bool p_use_proxies) const {
	TILEMAP_CALL_FOR_LAYER_V(p_layer, TileSetSource::INVALID_ATLAS_COORDS, get_cell_atlas_coords, p_coords, p_use_proxies);
}
int TileMap::get_cell_alternative_tile(int p_layer, const Vector2i &p_coords, bool p_use_proxies) const {
	TILEMAP_CALL_FOR_LAYER_V(p_layer, TileSetSource::INVALID_TILE_ALTERNATIVE, get_cell_alternative_tile, p_coords, p_use_proxies);
}
TileData *TileMap::get_cell_tile_data(int p_layer, const Vector2i &p_coords, bool p_use_proxies) const {
	TILEMAP_CALL_FOR_LAYER_V(p_layer, nullptr, get_cell_tile_data, p_coords, p_use_proxies);
}
Ref<TileMapPattern> TileMap::get_pattern(int p_layer, TypedArray<Vector2i> p_coords_array) {
	TILEMAP_CALL_FOR_LAYER_V(p_layer, Ref<TileMapPattern>(), get_pattern, p_coords_array);
}
Vector2i TileMap::map_pattern(const Vector2i &p_position_in_tilemap, const Vector2i &p_coords_in_pattern, Ref<TileMapPattern> p_pattern) {