Regular (operation) events that were created on demand prior
to a merge were not getting included in that merge. This was
detected once the validation rules were updated to check for
it. The bug has been fixed -- it was due to a stale read from
the cache ... once more regular events were created the stale
read was used to indicate which regular events to use as parents
and the newly created ones were not included; the stale read
data is now updated to account for this.