The change worked on my PC. The difference has been tested with limited changes 
to my userdata, but I try tomorrow with the next set of updates. The current 
snapshots are:
bertadmin@VM-Xubuntu-2110:~$ zfs list -t snapshot
NAME                                                               USED  AVAIL  
   REFER  MOUNTPOINT
bpool/BOOT/ubuntu_q3cgtj@211015-proposed                            56K      -  
   78.6M  -
rpool/ROOT/ubuntu_q3cgtj@211015-proposed                          54.0M      -  
   3.51G  -
rpool/ROOT/ubuntu_q3cgtj/srv@211015-proposed                         0B      -  
     96K  -
rpool/ROOT/ubuntu_q3cgtj/usr@211015-proposed                         0B      -  
     96K  -
rpool/ROOT/ubuntu_q3cgtj/usr/local@211015-proposed                   0B      -  
    144K  -
rpool/ROOT/ubuntu_q3cgtj/var@211015-proposed                         0B      -  
     96K  -
rpool/ROOT/ubuntu_q3cgtj/var/games@211015-proposed                   0B      -  
     96K  -
rpool/ROOT/ubuntu_q3cgtj/var/lib@211015-proposed                   300K      -  
   33.6M  -
rpool/ROOT/ubuntu_q3cgtj/var/lib/AccountsService@211015-proposed    56K      -  
    100K  -
rpool/ROOT/ubuntu_q3cgtj/var/lib/NetworkManager@211015-proposed    104K      -  
    140K  -
rpool/ROOT/ubuntu_q3cgtj/var/lib/apt@211015-proposed                 0B      -  
   79.6M  -
rpool/ROOT/ubuntu_q3cgtj/var/lib/dpkg@211015-proposed              256K      -  
   37.9M  -
rpool/ROOT/ubuntu_q3cgtj/var/log@211015-proposed                   416K      -  
   71.3M  -
rpool/ROOT/ubuntu_q3cgtj/var/mail@211015-proposed                    0B      -  
     96K  -
rpool/ROOT/ubuntu_q3cgtj/var/snap@211015-proposed                    0B      -  
     96K  -
rpool/ROOT/ubuntu_q3cgtj/var/spool@211015-proposed                  72K      -  
    112K  -
rpool/ROOT/ubuntu_q3cgtj/var/www@211015-proposed                     0B      -  
     96K  -
rpool/USERDATA/bertadmin_g64ltk@211015-proposed                   1.91M      -  
    177M  -
rpool/USERDATA/bertadmin_g64ltk@autozsys_6g35l0                    128K      -  
    176M  -
rpool/USERDATA/root_g64ltk@211015-proposed                           8K      -  
    812K  -
bertadmin@VM-Xubuntu-2110:~$

That autosys snapshot has been created automatically the first time I did run 
the next script to create a snapshot:  
 
zsysctl save $1 -s
zfs list -t snapshot | grep rpool
zfs list -t snapshot | grep bpool

According to the Internet the next commands would stop all autosys
snapshots

systemctl --user stop zsys-user-savestate.timer
systemctl --user disable zsys-user-savestate.timer
sudo mv /etc/apt/apt.conf.d/90_zsys_system_autosnapshot /etc/apt/apt.conf.d 
/90_zsys_system_autosnapshot_disabled

Did I make an error or is it another bug?

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https://bugs.launchpad.net/bugs/1946808

Title:
  zfs fails reverting to a previous snapshot on reboot when selected on
  grub

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