I had updated my Minecraft version to Beta 1.20.60.20 and realised I could not play on my server so I reverted back to 1.20.40 and now I am unable to create and get into my previous world in my previous worlds it says you have opened this world up in a new version and cannot be opened I can still play on servers but this is a single player issues
The top world crashes before I can even open it or load it (my world)
This is not a bug.
If you're on an older version of the game you need to create a new world. You cannot open worlds created in a newer version of the game on an older version.
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