Here's another bug, which first appeared, to my knowledge, in beta 5 and which persists in beta 6. I filed a bug report with each beta. It doesn't always happen, but I've seen it about 4 different times since the first day of beta 5.
The gist is that the portrait-mode search screen is sometimes misformatted, with a compressed search text field and 6 rather than 4 icons across in the suggestions. Rotating to landscape and back to portrait fixes it.
https://www.dropbox.com/s/7wv6aa0q8z4iivc/iOS 9.3b6 Bug.PNG?dl=0