The open-source firmware op24/25 for Flint 2/Beryl AX need to take some times, R&D run into a few issues and they are scheduling resources and investigation to troubleshoot them.
Confirm that this issue still occurs in v4.8.4, since the front-end update is not merged in this version; and it will be merged in v4.8.5 (or the next release) to fix this issue.
The drop-in gateway function is available and works fine. If the IP cannot be obtained, you can also fill it in manually.