### 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 ((uint32_t)ubo_data.size() != p_ubo_size) {
		p_uniform_dirty = true;
		if (uniform_buffer.is_valid()) {
			RD::get_singleton()->free(uniform_buffer);
			uniform_buffer = RID();
		}
		ubo_data.resize(p_ubo_size);
		if (ubo_data.size()) {
			uniform_buffer = RD::get_singleton()->uniform_buffer_create(ubo_data.size());
			memset(ubo_data.ptrw(), 0, ubo_data.size()); 
		}
		
		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_uniform_dirty && ubo_data.size()) {
		update_uniform_buffer(p_uniforms, p_uniform_offsets, p_parameters, ubo_data.ptrw(), ubo_data.size(), p_use_linear_color);
		RD::get_singleton()->buffer_update(uniform_buffer, 0, ubo_data.size(), ubo_data.ptrw(), p_barrier);
	}
	uint32_t tex_uniform_count = 0U;
	for (int i = 0; i < p_texture_uniforms.size(); i++) {