I tried it again a few minutes ago and it is still occurring. It's a personal world and I don't have a realms subscription. Strangely enough, I have been able to get into an old creative world that I ported from my 360 with no issues. Perhaps it has something to do with the size of the file.
I don’t think it’s an issue just with the beta. The new update, not even the beta, has kept me from logging into my world on Xbox because my last auto save is within two chunks of my base. It crashes out before I’m given a chance to move around.