I’ve had this happen many times now: when contributing to a project with an action, the sound loop gets stuck if another player contributes the action to goal completion. The UI also gets frozen and you need to close the Projects window altogether, but even then (and even when changing locations), the sound loop will continue playing over and over again as if you’re still [action]ing.
I've been others have a closely related bug of losing energy as if they're still doing that action, but I did not have that happen for me on any occasion. Only the sound loop bug.