With the today update i get problems with the app deck on two of my Nextclouds.
Optional parameter $userId declared before required parameter $path is implicitly treated as a required parameter at /var/www/virtual/username/html/cloud/apps/deck/lib/Service/ConfigService.php#234
There are issues e.g. here. Deck was mentioned during the upgrade that it would be disabled. This was not the case. However, it seems to be working. I just wanted to point that out. Maybe someone knows more. If you need deck maybe you do not upgrade to Nextcloud 29.0.1 and wait a few days.