MCPE (iOS) won't load saved games

Having a  similar problem using iOS on iPad Pro. Since 1.16.101, when I try to play my world that I’ve been playing for the last few years, the “Generating World” screen lasts for 5 minutes or more before the world loads. (It feels like I’m now playing on an old Commodore 64.)
When the world finally loads, it’s as though Minecraft time had passed during loading— if I had saved the game during daytime, it’s now nighttime or sometimes I die immediately.

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We're tracking this issue in MCPE-106349, so this ticket is being resolved and linked as a duplicate.

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