The bugs from 1.16.20 have pretty much returned and they are even worse than they were before, plus with many other bugs, but I'll tell the main one that is so annoying and makes the game nearly unplayable.
So Imagine opening up any kind of UI on your screen (menu, chest UI, chat, etc...)
Expected results: The UI opens up normally, nothing wrong happens.
The current results: Sometimes (can happen anytime, like right after launching the game, when you've been playing for a while, or anytime in between), a loading screen appears as if it is having connection issues and this even happens when on a single player world.
This makes the game close to impossible to play, so please fix this, As I am probably not the only one mad about this.
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Thank you for your report!
We're actually already tracking this issue at MCPE-111640, so I will resolve and link this ticket as a duplicate.
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Happens to me sometimes on the main menu screen when I click "Play" or any other option, then I have to close the game and then the "Software error. Closed software" error pops up on the Switch home menu.