In our deployment, we are using zookeepers as Kafka quorum.
Recently we upgraded Zookeeper from 3.4.14 to 3.5.7.
During the upgrade, we enabled snapshot.trust.empty and removed it after.
However, about 25% of zookeepers (all on 3.5.7) are not creating snapshot files, so they keep crashing on reboot with ERROR.
Nothing suspecious did I find from the zookeeper log.
I managed to reproduce the issue with the data from our servers, I put them in the attachment.