In a creative world, I am suddenly encountering the following crash. I was previously fiddling with the elytra harness and booster.
crash-2020-09-28_20.26.43-client.txt

That crash was actually from a stability field generator animation being weird. Eventually I'm planning on switching how block animations are done to something that won't do that, in the mean time that should hopefully be a one time crash.

Update with the fix will be available soon, get it here.