### 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)

StringName struct_name;
				DataPrecision precision = PRECISION_DEFAULT;
				DataType type;
				StringName name;
				int array_size = 0;
				if (tk.type == TK_CONST) {
					is_constant = true;
					tk = _get_token();
				}
				if (is_token_precision(tk.type)) {
					precision = get_token_precision(tk.type);
					tk = _get_token();
				}
				if (shader->structs.has(tk.text)) {
					is_struct = true;
					struct_name = tk.text;
				} else {
#ifdef DEBUG_ENABLED
					if (_lookup_next(next)) {
						if (next.type == TK_UNIFORM) {
							keyword_completion_context = CF_UNIFORM_QUALIFIER;
						}
					}
#endif 
					if (!is_token_datatype(tk.type)) {
						_set_error(RTR("Expected constant, function, uniform or varying."));
						return ERR_PARSE_ERROR;
					}
					if (!is_token_variable_datatype(tk.type)) {
						if (is_constant) {