### 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 (!global_shader_uniforms.instance_buffer_pos.has(p_instance)) {
		return; 
	}
	int32_t pos = global_shader_uniforms.instance_buffer_pos[p_instance];
	if (pos < 0) {
		return; 
	}
	ERR_FAIL_INDEX(p_index, ShaderLanguage::MAX_INSTANCE_UNIFORM_INDICES);
	Variant::Type value_type = p_value.get_type();
	ERR_FAIL_COND_MSG(p_value.get_type() > Variant::COLOR, "Unsupported variant type for instance parameter: " + Variant::get_type_name(value_type)); 
	ShaderLanguage::DataType datatype_from_value[Variant::COLOR + 1] = {
		ShaderLanguage::TYPE_MAX, 
		ShaderLanguage::TYPE_BOOL, 
		ShaderLanguage::TYPE_INT, 
		ShaderLanguage::TYPE_FLOAT, 
		ShaderLanguage::TYPE_MAX, 
		ShaderLanguage::TYPE_VEC2, 
		ShaderLanguage::TYPE_IVEC2, 
		ShaderLanguage::TYPE_VEC4, 
		ShaderLanguage::TYPE_IVEC4, 
		ShaderLanguage::TYPE_VEC3, 
		ShaderLanguage::TYPE_IVEC3, 
		ShaderLanguage::TYPE_MAX, 
		ShaderLanguage::TYPE_VEC4, 
		ShaderLanguage::TYPE_IVEC4,