Can't remove last "App" from the App Bar in iOS 11.2.1 iMessage.app? Turn screen to landscape mode.

On my iPhone 8 with iOS 11.2.1 I was unable to toggle off the last App (YouTube by alpha sort) in my plug-in list (what I mean). I turned phone to landscape mode and my touch was recognized. It’s not a screen touch bug because after doing this I could turn back to portrait mode and toggle it on/off at will. I suspect an array count or layout bug.