I've just created the world on the previous version after I learned about the "Old" worlds being removed in the latest beta. I just created it and quit afterwards. Then I updated my game and I couldn't open it anymore.
I'm on Android 10, as well, and the same issue happened to me. No experiments were enable though and my storage was also external.
I've just created the world on the previous version after I learned about the "Old" worlds being removed in the latest beta. I just created it and quit afterwards. Then I updated my game and I couldn't open it anymore.