Purchased collections have disappeared

Same problem here. Started yesterday.

I just encountered the same problem. It doesn't look like anyone is bothering to respond, given that the first post is 4 months old with absolutely no response. Typical of Microsoft "support" in my experience, but I keep hoping.

Yes, I know it's virtual money. Yes, I know it's just a game. But presumably they are trying to engage the users and get them hooked. This just irritates the heck out of me. (I would be more forceful in stating my annoyance, but this is a public forum.)
I can get games elsewhere and play them on other devices, or even better, go read or garden or exercise.

Yes, apparently this is happening again to many of us. Glad to see I'm not alone but I'm still disappointed. Game won't let me sign in, and the only puzzles that show up are ones I've already completed.

and now, magically, they have reappeared. I'd restarted the app several times, closed and reopened the Classic Jigsaw section repeatedly each time and the puzzle sets were gone. Now they are (at least mostly) there. I can't be sure all of them are, because
I didn't write down all the new ones I recently bought, but the ones I was specifically looking for suddenly reappeared the 5th time I reopened the Classic Jigsaw link.

Have you received any help on this issue? I am having the same problem. it is extremely frustrating!