I have noticed when I drag the eraser sometimes it doesn’t erase what I am trying to erase. It leaves behind some of what I tried erasing, and twice now it has refused to work all together. I also have two suggestions. I was thinking maybe a choice to rotate a selected object, rather than just manipulating its size. Though I proved it possible, it still seems to be a bit stubborn and I have to do more steps to get it how I want it. I was also thinking, maybe you could add stencils, or something like that. Yes, I am aware there ae shapes and lines, but I feel like a stencil would be easier to manipulate.
maybe you’re using a pencil instead of a brush. they behave differently because of how their paths work.
Sometimes if you have a group of items it will not erase the group, so try ungrouping it if you have a group.