See https://docs.google.com/document/d/1qWVFmuPI0z1Gmsk_gNHos0_vBVl8szIVyvPE98nSKDA/edit?tab=t.0 for a description of the kind of sub-op we're talking about. It's possible SPM-4434 will make some improvements here, in the process of resolving ticket deadlocks, but fully resolving this is likely out of scope for that project.

Split out from SERVER-91662.