1.15.1 Pre-release End crash

Hi, folks.  Ran into an issue in the prerelease re: the End.  I killed the dragon and portaled out, came back in and was about to take the portal to the end islands but the game repeatedly crashes while I am on an extremely dangerous end stone ladder.  It's the worst portal block ever right over the void on the main island and is EXTREMELY dangerous.  Have I mentioned it's dangerous? Well it is.  At any rate, multiple crashes later literally as soon as I zone in means that world is unplayable in 1.15.1 and I am stuck on the MOST DANGEROUS ladder ever.  Please make fixy? Thank you, and good night.