As part of SERVER-59673 we discovered that multi-document transactions stash their current WUOW and disable two-phase locking before profiling an operation.

However, this is only performed for updates and deletes. Inserts do not seem to go through that path and we are left wondering if inserts are being profiled in the same WUOW as the transaction. If they are then this would mean that they only get materialised once the transaction commits.