(this is my first bug report, apologies if I miss anything)

When trying to restore a course, we receive the below message

Unknown exception related to local files (Invalid file path)

Debug: Error code: storedfileproblem *
line 893 of \lib\filestorage\file_storage.php: file_exception thrown * line 906 of \backup\util\dbops\restore_dbops.class.php: call to file_storage->create_directory() *
line 1520 of \backup\moodle2\restore_stepslib.php: call to restore_dbops::send_files_to_pool() *
line 34 of \backup\util\plan\restore_execution_step.class.php: call to restore_course_legacy_files_step->define_execution() *
line 153 of \backup\util\plan\base_task.class.php: call to restore_execution_step->execute() *
line 163 of \backup\util\plan\base_plan.class.php: call to base_task->execute() *
line 157 of \backup\util\plan\restore_plan.class.php: call to base_plan->execute() *
line 315 of \backup\controller\restore_controller.class.php: call to restore_plan->execute() *
line 147 of \backup\util\ui\restore_ui.class.php: call to restore_controller->execute_plan() *
line 46 of \backup\restore.php: call to restore_ui->execute()