SERVER-85772 introduced into ConvertToCappedCoordinator new logic to clean up stale metadata that other DDLs may have left on some  local catalogs of the participants (as documented in SERVER-87010).

The clean up is performed through the sendDropCollectionParticipantCommandToShards command, which is incorrectly submitted with the fromMigrate: false parameter. This setting has the effect of potentially generating user-visible change stream events: in particular, a participant that holds stale metadata for the targeted collection would emit a drop entry for the targeted collection, which would cause change streams opened against such a namespace to be unexpectedly invalidated.

The problem may be addressed by just flipping the value of the fromMigrate parameter.