Perf pack tire question

So I had a nail in my tire and took it to Discount Tire.
They inadvertently "slashed" the tire on the machine. They gave me a new one, however I wanted to check with all of you first.
6,800 miles

1 old and 1 new tire in the rear. Will this cause any issues with the diff or anything?

Kinda want to go back and ask for another free rear tire

Thanks

Wont be an issue unless your other tires are really worn down.

Just find a parking lot and do a bunch of doughnuts so you slide into the new tire. That should wear it down pretty fast.

Thanks all!

The sidewall on the Pirellis are a joke. Both my ‘13 and ‘15 did the same when replacing the stock tires.