Nextcloud / MariaDB crashes randomly since update

Nextcloud version:
Operating system and version : Freebsd 12 iocage (Truenas 12)
Apache: latest
PHP version: 7.4

The issue you are facing:

I was running nextcloud V19 fine in freenas 11.3. The Nextcloud Config and the database are mounted in fstab. I setup a new jail using this manual:
and updated to V20 the same time. All went fine, i cant see any problems when i start up the jail - but that doesnt last long.

As soon as I run the cron.php via crontable or manually, the system stucks and the page only shows an error.

If manually restart mysql, my nextcloud site is up and running fine.

If i try a sql check it gets pretty strange.

full log file of nextcloud!Ar_eIBtD4lGqh_l-5GLw484h-anYTg?e=eYGEGn

I found the error code 1877 which also said missing or corrupt table. In your screenshot, do you know which table makes the database crash? After restart, check all the tables and see whats after the filecache table.