Can't Cast Zero Cost Spells When Magicka is < 0
On the latest nightly build, while wielding everyone's favorite fork (The Fork of Horripilation) I was unable to cast zero cost spells, such as "Ancestor Guardian" due to my magicka being at zero. I found out, from some testing, that when magicka is at zero, it still works, but because the fork took me into the negatives (Which wasn't shown on screen) I was unable to cast. Tested this in Vanilla Morrowind, and it works just fine. I tested this a few times, and got the same result each time. A message appears saying I don't have enough magicka to cast this spell.
Sorry for formatting or any lack of information I may have missed. This is the first time I've done a bug report.
Video showing it with the same build in both engines. https://youtu.be/gyxGnL9QEoo