Nextcloudpi Panel Mariadb down

I installed Nextcloudpi on a Raspberry 4.

Everything works fine, but the panel shows me that MariaDB service is down.
I searched the Internet, but I did not find any information.
Is there a documentation that tells me what may be the reason.
Thanks for any hint.

My Panel shows:
Nextcloud check|ok
Nextcloud version|
HTTPD service|up
PHP service|up
MariaDB service|down
Redis service|up
HPB service|up
Postfix service|up
internet check|ok
port check 80|open
port check 443|open

ncp-report shows the same, but it seems that after the update from buster to bullseye NextcloudPi panel is searching for the wrong service.