Our version of Safari will differ but have you encountered on your new Mac (mine is desktop flavour)
Mine is desktop too, but ver. 14.1.2
I haven’t experienced that problem yet though.
For confirmation, are you saying that you sometimes can’t scroll the screen down / up? Googling scrolling issues on Safari it appears that they crop up fairly regularly. In general from the reports I looked at it does seem a specifically Safari problem. Have you tried it in Firefox?