We root-caused the linked BF and identified a bug that could occur in the import/export collection flow. As part of the rollback correctness requirements, when we import a collection the newest_start_durable_ts must be older than the oldest_ts. When we are restarting the mongod, the oldest timestamp gets reset to the current time (via _lastCommittedOpTimeAndWallTime) which in the event that the machine is really fast and we have started the mongod within the same second, the timestamp assigned to oldest_ts could end up being the same second as the newest_start_durable_ts. Since we are in a new mongod, the opcounter would be 1 for the newly set oldest_ts, and this would always be older than that of the newest_start_durable_ts and hence our invariant would fail.

See example below:

newest start durable ts - (1749183999, 18)
oldest_ts - (1749183999, 1)

This ticket will address this by adding a three second sleep after we have exported the collection in the replsettest helper file.