TxDistributionInterceptor.ignorePreviousValueOnBackup() should return true to force backups to apply the update (unless write skew check is enabled). Not doing so might lead to a situation where the key is not available locally yet (state transfer in progress) and will be fetched remotely from another owner that has already executed the conditional command. The previous value check would fail then. The check adds little value on backup owners so it should not be done at all.