Entire Task List Lost

I seem to be experiencing the same or at least a very similar issue? Really odd but one of my Task Lists has disappeared, though the tasks themselves may still be there. I'm actually not sure because I have hundreds of tasks and they aren't very organized... so not a catastrophic loss as I guess they weren't that important, but I was specifically looking for that list to review it and possibly add a new task to it and it's a bit disconcerting to have it just go poof like that.

I was having trouble logging into the web version so as suggested I tried clearing cookies, using a different browser, ensuring the browser was up-to-date and restarting it (all of which allowed me to log into the web app), then also looking in the desktop app (Mac), and phone app (Android), the web site, and even the Outlook deleted items.

Despite all of that the list itself doesn't appear to be anywhere; it's just vanished.

In case this is a bug; does anyone know the best way to report it?