I bet if you look at the black dot closely, it really is a super small cursor arrow.
I understand you checked to make sure your graphics drivers are the latest. But, it could possibly still be the graphics drivers.
For me, Windows updated the graphics drivers during an update and it reported to be the latest version. I fixed by cursor issue by downloading the drivers directly from Intel and even though they were “the same version” it corrected the issue for me.
see the thread here;
Intel download page here;