We are seeing some baffling behaviour in a unit test (using
akka-persistence-inmemory).

The test starts actor A and actor B (which starts a stream using
eventsByTag in its
RecoveryCompleted handler).
The test then sends commands to actor A, which results in appropriately
tagged events being persisted.

Without going into all details, the assertion is based on a receiveN on a
probe.

What we see is that some elements at the beginning of the stream get missed
and the assertion fails.

We can make it pass by sending a message to actor A immediately after
starting it, or by putting a Thread.sleep at that point.

To add to the mystery, the test passes when run on its own, but fails when
run with others. That made us suspect issues with
akka-persistence-inmemory, but we do take steps to clean up the event
store, and logging of the stream elements persuaded us that was not the
issue.

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