in TheBrain 9 for iOS Beta
Pressing the search icon causes an immediate dump to OS home screen. I should add that this is with iOS 11 beta on an iPad Pro. It works find on my iPhone 7 with iOS 10.3.2. I forgot to check this functionality on the iPad before I jumped on the beta today. I can try it on one of my other iPads if you want. Or, it could be a beta-to-beta weirdness, but I thought I'd document it.