The resharding donor machinery forces an asynchronous catalog refresh which might end up happening during a second statement of any of the transactions in the resharding_generate_oplog_entries.js. Since a lock is hold, this generates a ShardCannotRefreshDueToLocksHeld.

In case this error is reported during a second or higher statement of the transaction, the router returns the error up to the user as a form of TransientTransactionError, which should be handled.