Magic Keyboard is not working with latest iPadOS 18 Developer Beta 1. It worked previously. I’m sure you will update it, just wanted to leave feedback on it. Mouse works, but has the apple mouse curs...
Upvoting to get visibility. I recognize it's a beta and going to break things. That's why I beta test, and submit feedback. As Myles indicated, it will work in a limited way if you turn on the on screen keyboard. Has issues allowing input if you switch apps and come back, you may have to turn the on screen keyboard off and back on, and is still not recognized in some applications on the server end.