Hey PaperCrown! Maybe this is a bug, can you describe what happens?
Do the dotted lines disappear when you draw over them?
When most visible dotted lines have disappeared, does the camera move to another position?
I draw over the lines and they sometimes disappear, but sometimes they don't and I end up drawing over them entirely so it gets hard to see where the dotted lines are, I also have really shaky hands when trying to draw lines so it might not register it as filled in. I've gotten through most of one but I got locked near the end.