### 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)

billboard_mode = p_mode;
	_queue_shader_change();
	notify_property_list_changed();
}
BaseMaterial3D::BillboardMode BaseMaterial3D::get_billboard_mode() const {
	return billboard_mode;
}
void BaseMaterial3D::set_particles_anim_h_frames(int p_frames) {
	particles_anim_h_frames = p_frames;
	RS::get_singleton()->material_set_param(_get_material(), shader_names->particles_anim_h_frames, p_frames);
}
int BaseMaterial3D::get_particles_anim_h_frames() const {
	return particles_anim_h_frames;
}
void BaseMaterial3D::set_particles_anim_v_frames(int p_frames) {
	particles_anim_v_frames = p_frames;
	RS::get_singleton()->material_set_param(_get_material(), shader_names->particles_anim_v_frames, p_frames);
}
int BaseMaterial3D::get_particles_anim_v_frames() const {
	return particles_anim_v_frames;
}
void BaseMaterial3D::set_particles_anim_loop(bool p_loop) {
	particles_anim_loop = p_loop;
	RS::get_singleton()->material_set_param(_get_material(), shader_names->particles_anim_loop, particles_anim_loop);
}
bool BaseMaterial3D::get_particles_anim_loop() const {
	return particles_anim_loop;
}
void BaseMaterial3D::set_heightmap_deep_parallax(bool p_enable) {