During object format change, config has both the old and new layout but here the old layout was already partially cleaned up, leaving the config in an invalid state and because of this, we observe the crash whenever clom tries to process that object as part of reconfigurations other than cleanup.
In most of the cases we have observed crashes during VOTES_REBALANCE since VOTES_REBALANCE workItem has a higher priority, though clom was posting CLEANUP workitem it was not getting processed causing clomd to crash.