Unrelated to anything, I wish there was a way to cancel Disguise Self besides taking a long rest. You'd think there would be an option to end it in the actions menu, but there doesn't seem to be. (I also cast it from a scroll, which shouldn't make a difference.) I used it to temporarily become a gnome so I could fit through a hole and now I want to be my regular elf self again. I haven't done anything to warrant resting yet!
There is - there should be a "dispel disguise" action available in the same place that "re-cast speak with dead" and special passive abilities appear. It's the far right of the general hotbar on keyboard/mouse. On controller you can just reselect Disguise Self and the dispel option will appear there... which may explain why you can't find it if you cast it from a scroll.