Node1 [PollExecutor thread] and Node2 [KieExecutorMDB thread] picked up the same async job and executed.

According to debug logs, the scenario was like this:

1. [PollExecutor thread] Start a Tx
2. [PollExecutor thread] The internal sub-query fetches the data (id=4666588, status=QUEUED)
3. [KieExecutorMDB thread] Start a Tx
4. [KieExecutorMDB thread] select and lock the data (id=4666588, status=QUEUED)
5. [KieExecutorMDB thread] update the data (id=4666588, status=RUNNING)
6. [KieExecutorMDB thread] Commit a Tx and release the lock
7. [PollExecutor thread] select and lock the data (id=4666588, status=QUEUED)
8. [PollExecutor thread] update the data (id=4666588, status=RUNNING)
9. [PollExecutor thread] Commit a Tx

-> So both threads will work with id=4666588...

For more detailed info, see private comment.