I can use everything normally (except for LibreTube that today decided not to load any video, but I don’t think it is relevant here), so I guess it’s another problem. BUT, just in case, how did you solve?

Stock

But in that case I wouldn’t be able to use any app, would I?

I prefer to keep it as plan Z since there would be many password recoveries and backups (and hope that I can also backup settings) to do. If I haven’t solved it in a couple of days, I’ll try that.

Edit: I tried to uninstall an app that needed no backup, but the widget is still invisible. Also, some system apps’ widgets don’t work either and I can’t uninstall those.

I tried twice, once with the reboot option and once powering it off for some minutes to let it rethink its life choices. Needless to say that it didn’t work.

I have already tried without success to:

1. Re-add the widgets (it has worked with two of the loading widgets, but not with the others)
2. Clear the cache
3. Re-Reboot
4. Uninstall and reinstall the problematic apps

August 20 update: the problem seems to have solved itself by just waiting?
Since I last commented on this post I haven’t rebooted my phone or attempted to re-add my widgets. Today I tried again, just to see if something has changed, and they actually loaded after a few seconds. I suppose it’s fine like that.