Ok – so $Aliases was added at some point after this thread.
My quick and humble fix will be to indicate with a badge those seedlings that have no alias at all, and additionally show $Aliases via $DisplayedAttributes – so I can see if those with aliases may still not have one in the speculative outline.
If I can carve out time, I’ll also try to get the actual logic I want, which would be a flag being set if
there is at least one alias of this note, in a specific container.