### Godot version

4.0.3

### System information

Win7

### Issue description

![image](https://github.com/godotengine/godot/assets/28286958/abec9d3c-e078-424c-9430-d9fe8897aad6)


### Steps to reproduce

1. Create shader
2. Add uint with hex, e.g. 0xffffu

### Minimal reproduction project

N/A
bool struct_dt = false;
					DataPrecision precision = PRECISION_DEFAULT;
					if (tk.type == TK_STRUCT) {
						_set_error(RTR("Nested structs are not allowed."));
						return ERR_PARSE_ERROR;
					}
					if (is_token_precision(tk.type)) {
						precision = get_token_precision(tk.type);
						tk = _get_token();
#ifdef DEBUG_ENABLED
						keyword_completion_context ^= CF_PRECISION_MODIFIER;
#endif 
					}
					if (shader->structs.has(tk.text)) {
						struct_name = tk.text;
#ifdef DEBUG_ENABLED
						if (check_warnings && HAS_WARNING(ShaderWarning::UNUSED_STRUCT_FLAG) && used_structs.has(struct_name)) {
							used_structs[struct_name].used = true;
						}
#endif 
						struct_dt = true;
					}
					if (!is_token_datatype(tk.type) && !struct_dt) {
						_set_error(RTR("Expected data type."));
						return ERR_PARSE_ERROR;
					} else {
						type = struct_dt ? TYPE_STRUCT : get_token_datatype(tk.type);
						if (precision != PRECISION_DEFAULT && _validate_precision(type, precision) != OK) {
							return ERR_PARSE_ERROR;
						}