### 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)

return transparency;
}
void BaseMaterial3D::set_alpha_antialiasing(AlphaAntiAliasing p_alpha_aa) {
	if (alpha_antialiasing_mode == p_alpha_aa) {
		return;
	}
	alpha_antialiasing_mode = p_alpha_aa;
	_queue_shader_change();
	notify_property_list_changed();
}
BaseMaterial3D::AlphaAntiAliasing BaseMaterial3D::get_alpha_antialiasing() const {
	return alpha_antialiasing_mode;
}
void BaseMaterial3D::set_shading_mode(ShadingMode p_shading_mode) {
	if (shading_mode == p_shading_mode) {
		return;
	}
	shading_mode = p_shading_mode;
	_queue_shader_change();
	notify_property_list_changed();
}
BaseMaterial3D::ShadingMode BaseMaterial3D::get_shading_mode() const {
	return shading_mode;
}
void BaseMaterial3D::set_depth_draw_mode(DepthDrawMode p_mode) {