I've noticed it too, but if my math is right, it's only adding a second, not a minute. If it were an entire minute it would count: 1:04, 1:03, 1:02, 1:01, 1:00, 2:60, 2:59, etc. And that would actually be 2 minutes added!
Whereas now it's 1:04, 1:03, 1:02, 1:01, 1:00, 0:60, 0:59, etc. 1:00 and 0:60 are equal.