I did a test cut in Jewelite with no issues. (I like this material for test cuts because it’s cheap, fast, polishes easily, and has a high RI).
I’ve cut other trillions with similar point angles from various materials, so I’m not convinced it’s the design. I’m reminded of the infamous “citrine from hell” from a few years ago.
What did you polish with? I used zirconium on a Darkside.