### 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)

GDCLASS(ShaderGlobalsEditorInterface, Object)
	void _set_var(const StringName &p_name, const Variant &p_value, const Variant &p_prev_value) {
		EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
		undo_redo->create_action(TTR("Set Shader Global Variable"));
		undo_redo->add_do_method(RS::get_singleton(), "global_shader_parameter_set", p_name, p_value);
		undo_redo->add_undo_method(RS::get_singleton(), "global_shader_parameter_set", p_name, p_prev_value);
		RS::GlobalShaderParameterType type = RS::get_singleton()->global_shader_parameter_get_type(p_name);
		Dictionary gv;
		gv["type"] = global_var_type_names[type];
		if (type >= RS::GLOBAL_VAR_TYPE_SAMPLER2D) {
			Ref<Resource> res = p_value;
			if (res.is_valid()) {
				gv["value"] = res->get_path();
			} else {
				gv["value"] = "";
			}
		} else {
			gv["value"] = p_value;
		}
		String path = "shader_globals/" + String(p_name);
		undo_redo->add_do_property(ProjectSettings::get_singleton(), path, gv);
		undo_redo->add_undo_property(ProjectSettings::get_singleton(), path, GLOBAL_GET(path));
		undo_redo->add_do_method(this, "_var_changed");
		undo_redo->add_undo_method(this, "_var_changed");
		block_update = true;
		undo_redo->commit_action();
		block_update = false;
	}
	void _var_changed() {