### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

memdelete_arr(global_shader_uniforms.buffer_values);
	memdelete_arr(global_shader_uniforms.buffer_usage);
	memdelete_arr(global_shader_uniforms.buffer_dirty_regions);
	RD::get_singleton()->free(global_shader_uniforms.buffer);
	
	RD::get_singleton()->free(quad_index_buffer); 
	
	for (int i = 1; i < RS::CANVAS_ITEM_TEXTURE_FILTER_MAX; i++) {
		for (int j = 1; j < RS::CANVAS_ITEM_TEXTURE_REPEAT_MAX; j++) {
			RD::get_singleton()->free(default_rd_samplers[i][j]);
		}
	}
	
	for (int i = 1; i < RS::CANVAS_ITEM_TEXTURE_FILTER_MAX; i++) {
		for (int j = 0; j < RS::CANVAS_ITEM_TEXTURE_REPEAT_MAX; j++) {
			if (custom_rd_samplers[i][j].is_valid()) {
				RD::get_singleton()->free(custom_rd_samplers[i][j]);
			}
		}
	}
	singleton = nullptr;
}
bool MaterialStorage::free(RID p_rid) {