### 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)

msdf_pixel_range = p_range;
	RS::get_singleton()->material_set_param(_get_material(), shader_names->msdf_pixel_range, p_range);
}
float BaseMaterial3D::get_msdf_pixel_range() const {
	return msdf_pixel_range;
}
void BaseMaterial3D::set_msdf_outline_size(float p_size) {
	msdf_outline_size = p_size;
	RS::get_singleton()->material_set_param(_get_material(), shader_names->msdf_outline_size, p_size);
}
float BaseMaterial3D::get_msdf_outline_size() const {
	return msdf_outline_size;
}
void BaseMaterial3D::set_distance_fade(DistanceFadeMode p_mode) {
	distance_fade = p_mode;
	_queue_shader_change();
	notify_property_list_changed();
}
BaseMaterial3D::DistanceFadeMode BaseMaterial3D::get_distance_fade() const {
	return distance_fade;
}
void BaseMaterial3D::set_distance_fade_max_distance(float p_distance) {
	distance_fade_max_distance = p_distance;
	RS::get_singleton()->material_set_param(_get_material(), shader_names->distance_fade_max, distance_fade_max_distance);
}
float BaseMaterial3D::get_distance_fade_max_distance() const {
	return distance_fade_max_distance;
}
void BaseMaterial3D::set_distance_fade_min_distance(float p_distance) {