I tested again up to the point where you gain control of your character and I did not crash. I did not use the latest update for this test. I remember it was mentioned to rename one of the files in the romfs so it could have been that which is easy to forget about if you have been testing on...
I have played sun up to the water trial and had no issues. I am not using the latest update that fixed phantump etc. so it might have something to do with that.
Is there any convenient method for viewing the type, stat and movepool changes? I've noticed some of the changes but I couldn't seem to find a specific list of all of the changes in a convenient form.