Adding a relation to another relation doesn't prompt save

[SomeoneElseOSM]

In https://www.openstreetmap.org/changeset/112692917 , I was re-adding the (recently undeleted) Llŷn Coastal Path back into the Wales Coast Path. Until I also nudged a node, I wasn't offered the chance to save data. Once I'd nudged a node, that node change, a null change to Llŷn http://osm.mapki.com/history/relation.php?id=1820886 and the desired change to the WCP https://www.openstreetmap.org/relation/1820890 were written..

The null change to "the relation being added to the other relation" isn't a big deal, but it'd be nice not to have to nudge a node to update the superrelation.