ON SWITCH. I made a world and played on it for a good amount of time before deciding to upload it to a realm (a service I ignificant amount of time) I couldnt. After doing reading on it I presumed it would be fixed in 1.16.2. So I went 2 weeks without playing because I was waiting for the update to happen so I could put it on a realm for other devices. The update is out, the problem is even worse. Not only can I not upload the world, but my system crashes upon leaving the application.
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This makes me so mad. I literally bought a realms plus subscription the other day because I wanted to transfer my switch world to pc. I found this bug, checked the tracker which said it would be fixed in 1.16.20 so I waited till today. And of course, Mojang didn't deliver. I tired of Bedrock being the "buggy" platform. Minecraft is the best selling game of all time, if they need more staff to sort through bugs, they can get it. Plus bedrock has a way larger team than java and this stuff still happens. Very disappointing.

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We're tracking this issue in MCPE-95621, so this ticket is being resolved and linked as a duplicate.
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Just upgraded to 1.16.2. I am able to upload worlds now. Even through the system still shows an error dialog, the world does seem to get replaced. The new problem is that upon quitting the game, the entire Switch system freezes for anywhere from 5-15 minutes. It requires a hardboot to bypass this wait. The Switch needs an emergency patch to fix the freezing problem.