Question 2.5D shader issue

I use this shader to have my sprites interact with a 3d lighting environment with HDRP, but I've been running into an issue where the character just.. disappears when it's flipped, rotated past 90 degrees, or scaled to -1 on x. This has resulted in me not being able to move my character back without him disappearing into the abyss, and I'm wondering what do to do circumnavigate this.


Also I've tried enabling two-sided on the PBR master, but that just created a whole new set of visual issues.