Multi-language support is a key part of modern smartphone operating systems, and in iOS, the operating system for Apple’s mobile devices, it is partly invoked on the keyboard with a “globe” key on the lower left side of the virtual keyboard. In the newest update to iOS, version 12, this placement of the globe key is different depending on if you are using an iPad or an iPhone. Which is intensely annoying. I’d consider this a bug, and may have just missed out if testers didn’t consider switching between language inputs between devices.