Sorry, I probably reported something which was already reported once.
This bug is identical or similar to:
https://bugs.launchpad.net/ubuntu/+source/zsys/+bug/1967585
The same solution described there works, eg: download older version of zsys,
install it via APT, and then
$ sudo apt-mark hold z
Public bug reported:
root@Mainframe:/# systemctl status zsysd
× zsysd.service - ZSYS daemon service
Loaded: loaded (/lib/systemd/system/zsysd.service; static)
Active: failed (Result: exit-code) since Sun 2022-04-03 15:41:34 CEST;
27min ago
TriggeredBy: × zsysd.socket
Process: 230061
