I also ran a quick test on 4 people. I asked them to use a particular website whereby one of the main buttons (checkout) did not have a cursor.
I did not guide them, or explain anything — they were just tasked with finding a product and clicking checkout.
At the very end I asked if they noticed anything about the buttons. And nobody said anything regarding the cursor. They said it was very easy.
It’s just 4 people, but 4 people none-the-less.