A slow query can fail to report storage statistics, https://github.com/mongodb/mongo/blob/5e5c97b34ff6d457dfd4ad65644e42675e2b9993/src/mongo/db/curop.cpp#L488-L491 There does not appear to be any need for the RSTL, https://github.com/mongodb/mongo/blob/5e5c97b34ff6d457dfd4ad65644e42675e2b9993/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L905-L920, so these report should be allowed to succeed