### 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)

prev_material = mat;
						prev_z_index = tile_z_index;
					} else {
						
						ci = prev_ci;
					}
					const Vector2 local_tile_pos = tile_map_node->map_to_local(cell_data.coords);
					
					real_t random_animation_offset = 0.0;
					if (atlas_source->get_tile_animation_mode(cell_data.cell.get_atlas_coords()) != TileSetAtlasSource::TILE_ANIMATION_MODE_DEFAULT) {
						Array to_hash;
						to_hash.push_back(local_tile_pos);
						to_hash.push_back(get_instance_id()); 
						random_animation_offset = RandomPCG(to_hash.hash()).randf();
					}
					
					tile_map_node->draw_tile(ci, local_tile_pos - rendering_quadrant->canvas_items_position, tile_set, cell_data.cell.source_id, cell_data.cell.get_atlas_coords(), cell_data.cell.alternative_tile, -1, tile_map_node->get_self_modulate(), tile_data, random_animation_offset);
				}
			} else {
				
				for (int i = 0; i < rendering_quadrant->canvas_items.size(); i++) {
					const RID &ci = rendering_quadrant->canvas_items[i];
					if (ci.is_valid()) {
						rs->free(ci);
					}
				}
				rendering_quadrant->cells.clear();
				rendering_quadrant_map.erase(rendering_quadrant->quadrant_coords);
			}
			quadrant_list_element = next_quadrant_list_element;