We have started seeing sever errors in the ArcGIS Server Error logs if the form
CleanForwardEdits failure (sessionID: {xxxx}, moment: 45014.728694) Invalid branch moment [version_name]
The errors happen on a particular feature service. This feature service contains a Parcel Fabric, I don't know if this is relevant.
I have talked to the editors and can't find the source. Is anybody familiar with the cause of these errors?