UE4 Crashes trying to import alembic file

I’m using UE4 version 4.20 and I’m trying to import alembic animations that have been exported from maya 2018, but everytime I try to import one, it crashes before I can finish. I have gotten some test caches down to 4mb and it still crashes! Has anyone else had this problem and/or found a solution?

Cheers

Seems to be a 4.20 problem: