Run this in the web terminal:
cat /etc/modprobe.d/zfs.conf
and you'll see:
# zfs data corruption mitigation, re: https://github.com/openzfs/zfs/issues/15526
options zfs zfs_dmu_offset_next_sync=0
I can confirm it's not just you, my containers have also not been updating. My logs, like yours, also say that there's no update available for containers which do have updates.