I am using Admin Panel v 4.1.2 release 3.
When I added manual input in WireGuard configuration and saved, it was unable to save “PresharedKey” (this field was removed upon saving). I have to edit and change by UI
Moreover, when I configured MTU by UI then deleted it by manual input, after saving, it was still there.
The latest 4.2 release has fixed this issue, and you can download the latest 4.2 beta release for testing.