I think you are right about it being an undocumented change, but I'm still not sure if they will revert it back at some point. I'm doing a similar fix like you described for now.
Pre-iOS 16 the values returned for editingInteractionConfiguration were "none" and "default" with "none" being the default behavior.
Moby Pixel
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Thank you, kkq! Hopefully they will fix the issue completely in a future iOS update, but this will work for now. I'm using SwiftUI so this worked for me:
extension UIWindow {
open override var editingInteractionConfiguration: UIEditingInteractionConfiguration { return .none }
open override var canBecomeFirstResponder: Bool { return true }
}