I've tried on Safari 14.0.3 / Mac OS 11.2.3 and while the cursor does appear to move, its actual position, as determined by what happens when I actually move it, doesn't seem to change.
For example, if I manually move the cursor almost to the top of the page, but not quite, it will move around. Sometimes it disappears "under" the fixed part of the browser. But if I attempt to move it manually, the cursor "teleports" to where I initially left it.
I've tried on Safari 14.0.3 / Mac OS 11.2.3 and while the cursor does appear to move, its actual position, as determined by what happens when I actually move it, doesn't seem to change.
For example, if I manually move the cursor almost to the top of the page, but not quite, it will move around. Sometimes it disappears "under" the fixed part of the browser. But if I attempt to move it manually, the cursor "teleports" to where I initially left it.