### 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)

emit_signal(SNAME("var_changed"));
	}
protected:
	static void _bind_methods() {
		ClassDB::bind_method("_set_var", &ShaderGlobalsEditorInterface::_set_var);
		ClassDB::bind_method("_var_changed", &ShaderGlobalsEditorInterface::_var_changed);
		ADD_SIGNAL(MethodInfo("var_changed"));
	}
	bool _set(const StringName &p_name, const Variant &p_value) {
		Variant existing = RS::get_singleton()->global_shader_parameter_get(p_name);
		if (existing.get_type() == Variant::NIL) {
			return false;
		}
		call_deferred("_set_var", p_name, p_value, existing);
		return true;
	}
	bool _get(const StringName &p_name, Variant &r_ret) const {