### 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)

ERR_FAIL_COND_V(p_func->op != OP_CALL && p_func->op != OP_CONSTRUCT, false);
	Vector<DataType> args;
	Vector<StringName> args2;
	Vector<int> args3;
	ERR_FAIL_COND_V(p_func->arguments[0]->type != Node::NODE_TYPE_VARIABLE, false);
	StringName name = static_cast<VariableNode *>(p_func->arguments[0])->name.operator String();
	for (int i = 1; i < p_func->arguments.size(); i++) {
		args.push_back(p_func->arguments[i]->get_datatype());
		args2.push_back(p_func->arguments[i]->get_datatype_name());
		args3.push_back(p_func->arguments[i]->get_array_size());
	}
	int argcount = args.size();
	if (p_function_info.stage_functions.has(name)) {
		
		const StageFunctionInfo &sf = p_function_info.stage_functions[name];
		if (argcount != sf.arguments.size()) {
			_set_error(vformat(RTR("Invalid number of arguments when calling stage function '%s', which expects %d arguments."), String(name), sf.arguments.size()));
			return false;
		}
		
		for (int i = 0; i < argcount; i++) {
			if (args[i] != sf.arguments[i].type) {
				_set_error(vformat(RTR("Invalid argument type when calling stage function '%s', type expected is '%s'."), String(name), get_datatype_name(sf.arguments[i].type)));
				return false;
			}