CASSANDRA-20256: Fix 0xe299233a8efdcefdl in AccordSimulationRunner

[ifesdjeen]

java.lang.RuntimeException: /127.0.0.2:7012 Command@2104690279{[16,1577854825922011,68(KE),1]:Stable}
at accord.local.Command.(Command.java:149)
at accord.local.Command$PreAccepted.(Command.java:619)
at accord.local.Command$Accepted.(Command.java:683)
at accord.local.Command$Committed.(Command.java:740)
at accord.local.Command$Committed.committed(Command.java:709)
at accord.local.Command.stable(Command.java:1528)
at accord.local.SafeCommand.stable(SafeCommand.java:129)
at accord.local.Commands.ephemeralRead(Commands.java:408)
at accord.messages.ReadEphemeralTxnData.apply$unsync(ReadEphemeralTxnData.java:97)
at accord.messages.ReadEphemeralTxnData.apply(ReadEphemeralTxnData.java)
at accord.messages.ReadData.apply(ReadData.java:218)
at accord.messages.ReadData.apply(ReadData.java:64)
at org.apache.cassandra.service.accord.AccordTask$ForFunction.apply(AccordTask.java:109)
at org.apache.cassandra.service.accord.AccordTask$ForFunction.apply(AccordTask.java:96)
at org.apache.cassandra.service.accord.AccordTask.run(AccordTask.java:658)
at org.apache.cassandra.service.accord.AccordExecutor$CommandStoreQueueTask.run(AccordExecutor.java:726)
at org.apache.cassandra.service.accord.AccordExecutorAbstractLockLoop.runWithoutLock(AccordExecutorAbstractLockLoop.java:249)
at org.apache.cassandra.concurrent.InfiniteLoopExecutor.loop(InfiniteLoopExecutor.java:125)

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