After installing 14.0, while moving forward, I am unable to travel and move up a block with tapping the jump button. Traveling up stairs seems to work fine. Also, while swimming I sink to the bottom unless I hold the jump button. This happens for all old files and any new ones. Both my iPad and my iPhone behaved the same. I installed 14.0 on my first generation iPad and it worked properly, so I deleted Minecraft off of my iPhone and reinstalled it, and now it works properly. The largest file I have on my iPad Air is 58.1 MB.

I could erase and the App and reinstall it on my iPad Air, and fairly certain it would work fine, but I have a few games that has weeks and months of work that will be lost.