Rideli

It's because you're traveling faster than the world can generate. I'd probably bet that you were not over water when you landed either, only when you last saw before it quit generating. Try hovering slower or occasionally doing a quick circle to let tje generation catch up. I fly a lot too and can sometime get ahead of myself, fly really high that way if you hit a barrier you have time to hit the glide button again before hitting the ground. If you were allowed to outrun chunks you would be able to x-ray the whole world around you and probably crash the game. 

I also have this issue, not only with enchanted weapons but with anything enchanted in my hand on Android version 7.1 (via android emulator 'Bluestacks'). Also brand new to me since going beta on same world I've always played. I will crash completely trying to hit any entities with enchanted weapons, enchanted armor in my hand or an enchanted fishing rod (although I can still cast the rod and hit entities fine). I can not reproduce this bug on my phone running android 8.1.0 though with the same world. Also not running any mods or add-ons although I do have some downloaded.