The checkpoint coordinator takes a checkpoint based (amongst other things) on the time delta between `steady_clock::now()` and `_lastCheckpointTimestamp` (here)]

However `_lastCheckpointTimestamp` is only being default constructed and so starts off at the epoch of `steady_clock` which in general might already be behind `now()` by more than the checkpoint interval.

So we may end up with an unexpected checkpoint at start time.