1. Create a Group Plus instance and join it.
  2. Using another account, open the World Detail menu with the instance
  3. Then, the "Drop Portal" button is enabled. Use it to try to place a portal.
  4. The portal appears, then it disappears instantly.
If the instance type is Friend Plus, the "Drop Portal" button is disabled. I expected it is also disabled in the Group Plus case.
Log:
2023.05.31 23:23:54 Log - [Always] Fetched local user permissions
2023.05.31 23:24:00 Error - The local user is not a member of this group
2023.05.31 23:24:03 Log - [Always] [PortalManager] Received portal request failure!