### 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)

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);
		render_target_cache.clear();
		p_textures_dirty = true;
		
		if (uniform_set.is_valid() && RD::get_singleton()->uniform_set_is_valid(uniform_set)) {
			RD::get_singleton()->uniform_set_set_invalidation_callback(uniform_set, nullptr, nullptr);
			RD::get_singleton()->free(uniform_set);
			uniform_set = RID();
		}
	}
	if (p_textures_dirty && tex_uniform_count) {
		update_textures(p_parameters, p_default_texture_params, p_texture_uniforms, texture_cache.ptrw(), true);
	}
	if (p_ubo_size == 0 && (p_texture_uniforms.size() == 0)) {
		
		return false;
	}
	if (!p_textures_dirty && uniform_set.is_valid() && RD::get_singleton()->uniform_set_is_valid(uniform_set)) {
		
		return false;
	}
	Vector<RD::Uniform> uniforms;
	{
		if (p_ubo_size) {
			RD::Uniform u;
			u.uniform_type = RD::UNIFORM_TYPE_UNIFORM_BUFFER;
			u.binding = 0;