### 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)

ClassDB::bind_method(D_METHOD("get_clearcoat"), &BaseMaterial3D::get_clearcoat);
	ClassDB::bind_method(D_METHOD("set_clearcoat_roughness", "clearcoat_roughness"), &BaseMaterial3D::set_clearcoat_roughness);
	ClassDB::bind_method(D_METHOD("get_clearcoat_roughness"), &BaseMaterial3D::get_clearcoat_roughness);
	ClassDB::bind_method(D_METHOD("set_anisotropy", "anisotropy"), &BaseMaterial3D::set_anisotropy);
	ClassDB::bind_method(D_METHOD("get_anisotropy"), &BaseMaterial3D::get_anisotropy);
	ClassDB::bind_method(D_METHOD("set_heightmap_scale", "heightmap_scale"), &BaseMaterial3D::set_heightmap_scale);
	ClassDB::bind_method(D_METHOD("get_heightmap_scale"), &BaseMaterial3D::get_heightmap_scale);
	ClassDB::bind_method(D_METHOD("set_subsurface_scattering_strength", "strength"), &BaseMaterial3D::set_subsurface_scattering_strength);
	ClassDB::bind_method(D_METHOD("get_subsurface_scattering_strength"), &BaseMaterial3D::get_subsurface_scattering_strength);
	ClassDB::bind_method(D_METHOD("set_transmittance_color", "color"), &BaseMaterial3D::set_transmittance_color);
	ClassDB::bind_method(D_METHOD("get_transmittance_color"), &BaseMaterial3D::get_transmittance_color);
	ClassDB::bind_method(D_METHOD("set_transmittance_depth", "depth"), &BaseMaterial3D::set_transmittance_depth);
	ClassDB::bind_method(D_METHOD("get_transmittance_depth"), &BaseMaterial3D::get_transmittance_depth);
	ClassDB::bind_method(D_METHOD("set_transmittance_boost", "boost"), &BaseMaterial3D::set_transmittance_boost);
	ClassDB::bind_method(D_METHOD("get_transmittance_boost"), &BaseMaterial3D::get_transmittance_boost);
	ClassDB::bind_method(D_METHOD("set_backlight", "backlight"), &BaseMaterial3D::set_backlight);
	ClassDB::bind_method(D_METHOD("get_backlight"), &BaseMaterial3D::get_backlight);
	ClassDB::bind_method(D_METHOD("set_refraction", "refraction"), &BaseMaterial3D::set_refraction);
	ClassDB::bind_method(D_METHOD("get_refraction"), &BaseMaterial3D::get_refraction);
	ClassDB::bind_method(D_METHOD("set_point_size", "point_size"), &BaseMaterial3D::set_point_size);
	ClassDB::bind_method(D_METHOD("get_point_size"), &BaseMaterial3D::get_point_size);
	ClassDB::bind_method(D_METHOD("set_detail_uv", "detail_uv"), &BaseMaterial3D::set_detail_uv);
	ClassDB::bind_method(D_METHOD("get_detail_uv"), &BaseMaterial3D::get_detail_uv);
	ClassDB::bind_method(D_METHOD("set_blend_mode", "blend_mode"), &BaseMaterial3D::set_blend_mode);
	ClassDB::bind_method(D_METHOD("get_blend_mode"), &BaseMaterial3D::get_blend_mode);
	ClassDB::bind_method(D_METHOD("set_depth_draw_mode", "depth_draw_mode"), &BaseMaterial3D::set_depth_draw_mode);
	ClassDB::bind_method(D_METHOD("get_depth_draw_mode"), &BaseMaterial3D::get_depth_draw_mode);
	ClassDB::bind_method(D_METHOD("set_cull_mode", "cull_mode"), &BaseMaterial3D::set_cull_mode);
	ClassDB::bind_method(D_METHOD("get_cull_mode"), &BaseMaterial3D::get_cull_mode);
	ClassDB::bind_method(D_METHOD("set_diffuse_mode", "diffuse_mode"), &BaseMaterial3D::set_diffuse_mode);