You referring to the “SET GROUP”-option of a group item, right?
Because then you’re right, if you copy the items of a group into another group, the new items are only a copy with the characteristics of the old ones, from the point of copying.
If you make changes to the old item afterwards, the item copy inside the new group will not be synchronized.
I would think this not a bug,
but a kind of “synced-copy / live-copy” sounds like an interesting feature
@fontsdetramuntana, here is a thread that also apply on this topic i guess:
It’s about assigning more groups to one item:
And maybe this on: