### 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)

bool has_a_tile = false;
			for (SelfList<CellData> *cell_data_list_element = rendering_quadrant->cells.first(); cell_data_list_element; cell_data_list_element = cell_data_list_element->next()) {
				CellData &cell_data = *cell_data_list_element->self();
				if (cell_data.cell.source_id != TileSet::INVALID_SOURCE) {
					has_a_tile = true;
					break;
				}
			}
			if (has_a_tile) {
				
				
				for (RID &ci : rendering_quadrant->canvas_items) {
					rs->free(ci);
				}
				rendering_quadrant->canvas_items.clear();
				
				if (tile_map_node->is_y_sort_enabled() && is_y_sort_enabled()) {
					
					rendering_quadrant->cells.sort_custom<CellDataYSortedComparator>();
				} else {
					rendering_quadrant->cells.sort();
				}
				
				Ref<Material> prev_material;
				int prev_z_index = 0;
				RID prev_ci;
				for (SelfList<CellData> *cell_data_quadrant_list_element = rendering_quadrant->cells.first(); cell_data_quadrant_list_element; cell_data_quadrant_list_element = cell_data_quadrant_list_element->next()) {
					CellData &cell_data = *cell_data_quadrant_list_element->self();
					TileSetAtlasSource *atlas_source = Object::cast_to<TileSetAtlasSource>(*tile_set->get_source(cell_data.cell.source_id));