Found another Sprite flip-out, but knowing how to narrow down what is causing it from the last one should speed this fix.
Location of the sprite mixing: Backrooms entrance.
How to get it (Probably)? Enter the backrooms -> Lose once to the smiler and have the marked condition -> Leave without losing again, causing the de-buff to get removed -> Return to the backrooms. (I only returned to knock her up and leave, don't judge.)
Edit* Impregnated her, and once I got out again the game gave the same cut-scene as the first time where Orical gives a call and asks you to look around, but you can just leave without issue.