DEDECKER

I have same issue , on windows 10 bedrock edition since 1.16, all worlds where i have visited nether in 1.14.60 version can't be opened.

Seems to be ok with worlds where i did not enter nether 

I'm having same issue with some of my worlds (i'm on bedrock edition windows 10)

From what i guess, it's only in worlds where i went to nether in previous version (1.14.60)

In worlds were i did not visit nether , it's ok

Would be happy to be able load them again, especially one which was in creative mode were i made / tried a lot of things with redstone and would took weeks to create them again