cadelf, when you copy the room tags from a level and pasting them into another level,
U must have already placed the rooms in the other level aswell,
Copy the tags with their room elements as well 😉
the tags simply grabs the information from the room element , they doesn't create information without the host "Which is the room element it self"
So simply when copying the room tags, make sure you copy the room elements them selves as well
to how them and to pick them easily , go to VG .. > Rooms , Expand it with the + , then > check on interior fill.
TIP : When copying, use Ctrl+C .. then go to the other level, fom the Modify tab > Paste , dropdown > then align to current view,
Assuming it's typical rooms as they're in the previous level you made the copy from