### 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)

DataType type = TYPE_VOID;
	String struct_name = "";
	int array_size = 0;
	bool auto_size = false;
	TkPos prev_pos = _get_tkpos();
	Token tk = _get_token();
	if (tk.type == TK_CURLY_BRACKET_OPEN) {
		auto_size = true;
	} else {
		if (shader->structs.has(tk.text)) {
			type = TYPE_STRUCT;
			struct_name = tk.text;
		} else {
			if (!is_token_variable_datatype(tk.type)) {
				_set_tkpos(prev_pos);
				Node *n = _parse_and_reduce_expression(p_block, p_function_info);