### Godot version

4.1.1 stable

### System information

Windows 10

### Issue description

this is the default size loaded on startup 1024 which seems fine but it actually have loaded the default [2048] and ignored the size in project settings
![image](https://github.com/godotengine/godot/assets/53877170/c8c71de7-468a-487f-8e6c-dba1ce0f8fa5)

changing it now to any size will break it 
[2048]
![image](https://github.com/godotengine/godot/assets/53877170/3082ff09-b7d7-41f7-8fbb-813074a54135)

[512]
![image](https://github.com/godotengine/godot/assets/53877170/5ea4620f-52b5-4d0e-a5f5-747e777cd59d)


### Steps to reproduce

change 2d shadow atlas size in project settings while using compatibility renderer. 

### Minimal reproduction project

_
if (material.is_null()) {
					if (ci->canvas_group->mode == RS::CANVAS_GROUP_MODE_CLIP_ONLY) {
						material = default_clip_children_material;
					} else {
						material = default_canvas_group_material;
					}
				}
			}
		}
		if (material != state.canvas_instance_batches[state.current_batch_index].material) {
			_new_batch(batch_broken);
			GLES3::CanvasMaterialData *material_data = nullptr;
			if (material.is_valid()) {
				material_data = static_cast<GLES3::CanvasMaterialData *>(material_storage->material_get_data(material, RS::SHADER_CANVAS_ITEM));
			}
			shader_data_cache = nullptr;
			if (material_data) {
				if (material_data->shader_data->version.is_valid() && material_data->shader_data->valid) {
					shader_data_cache = material_data->shader_data;
				}
			}
			state.canvas_instance_batches[state.current_batch_index].material = material;
			state.canvas_instance_batches[state.current_batch_index].material_data = material_data;
		}
		GLES3::CanvasShaderData::BlendMode blend_mode = shader_data_cache ? shader_data_cache->blend_mode : GLES3::CanvasShaderData::BLEND_MODE_MIX;
		_record_item_commands(ci, p_to_render_target, p_canvas_transform_inverse, current_clip, blend_mode, p_lights, index, batch_broken, r_sdf_used);
	}
	if (index == 0) {
		
		state.current_batch_index = 0;