### 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)

if (p_uniform_dirty && ubo_data.size()) {
		update_uniform_buffer(p_uniforms, p_uniform_offsets, p_parameters, ubo_data.ptrw(), ubo_data.size(), true);
		glBindBuffer(GL_UNIFORM_BUFFER, uniform_buffer);
		glBufferData(GL_UNIFORM_BUFFER, ubo_data.size(), ubo_data.ptrw(), GL_DYNAMIC_DRAW);
		glBindBuffer(GL_UNIFORM_BUFFER, 0);
	}
	uint32_t tex_uniform_count = 0U;
	for (int i = 0; i < p_texture_uniforms.size(); i++) {
		tex_uniform_count += uint32_t(p_texture_uniforms[i].array_size > 0 ? p_texture_uniforms[i].array_size : 1);
	}
	if ((uint32_t)texture_cache.size() != tex_uniform_count || p_textures_dirty) {
		texture_cache.resize(tex_uniform_count);
		p_textures_dirty = true;
	}
	if (p_textures_dirty && tex_uniform_count) {
		update_textures(p_parameters, p_default_texture_params, p_texture_uniforms, texture_cache.ptrw(), true);
	}
}
MaterialStorage *MaterialStorage::singleton = nullptr;
MaterialStorage *MaterialStorage::get_singleton() {
	return singleton;
}
MaterialStorage::MaterialStorage() {
	singleton = this;
	shader_data_request_func[RS::SHADER_SPATIAL] = _create_scene_shader_func;
	shader_data_request_func[RS::SHADER_CANVAS_ITEM] = _create_canvas_shader_func;
	shader_data_request_func[RS::SHADER_PARTICLES] = _create_particles_shader_func;
	shader_data_request_func[RS::SHADER_SKY] = _create_sky_shader_func;
	shader_data_request_func[RS::SHADER_FOG] = nullptr;
	material_data_request_func[RS::SHADER_SPATIAL] = _create_scene_material_func;