When a shard split recipient applies the recipient config locally, it should also reset the lastCommittedOpTime to the blockTimestamp. We will need to get the blockTimestamp from somewhere, current ideas are:

• Query the TenantMigrationAccessBlockerRegistry for shard split access blockers (they can gain an accessor for their blockTimestamp)
• Query the shardSplitDonors namespace for any documents representing an active shard split, and read the value directly from the state document