You're right, I've noticed that it doesn't happen everywhere, but where there are small shapes, it erases them. See attachment.
If you try to make a rectangle and then run the small eraser over it, it will cut perfectly, but if there are various shapes such as small circles or small triangles, when the eraser touches them even tangentially, those shapes will be erased. I don't know if I've made myself clear.
You're right, I've noticed that it doesn't happen everywhere, but where there are small shapes, it erases them. See attachment.
If you try to make a rectangle and then run the small eraser over it, it will cut perfectly, but if there are various shapes such as small circles or small triangles, when the eraser touches them even tangentially, those shapes will be erased. I don't know if I've made myself clear.