[email/IMAP] Synchronization occasionally falling into synchronizing fro...

...m the epoch (1970, 1969 time-zone adjusted)
Let's put in a log statement here so we know if we hit this issue, which may also point to issues if the call was expected to do a refresh. We can then use that log statement for debugging the deeper cause of getting into a state where startTS is null and the bridgeHandle/slice is dead, but we still ask the slice to do something.