Before the 1.4 update, using “/move” (CMD + SHIFT + M) used to move the Rem to whatever parent you select, and would leave behind a portal in its original place.
Now it appears to not do this anymore? Instead it moves the Rem, and leaves nothing behind in its place.
I’ve mentioned this in a thread in the Feature Requests subforum, but I think this is actually a bug and not a new feature request.