Between the moment a rename collection participant snapshots range deletion task documents and the moment they are restored, the range-deleter could potentially process some deletions.

If that happens, it would mean that:

• The count of orphaned documents for the target collection on disk after the rename may be off for a while
• The BalancerStatsRegistry may track wrong statistics for a while

PS: "a while" means until existing range deletions are drained.