Looks like it's a normal feature however disconcerting it may appear
you are correct, totally normal ive seen it on every t-belt that ive replaced. its where both ends of the belt come together.
the only time that ive seen cuts on the belt are when the retainer plate gets reinstalled backwards or the water pump starts to fail but even then its not a cut across the belt its more like the belt gets chewed up on the edge where the damage is occurring.
also a little weird to pull the timing cover doing the drive belts but i have done that on cars that were up in mileage and no replacement sticker just to take a peak and see how it looked,