I am well aware of what we call "The spin glitch" but I have only seen this in skins game's AFTER a player "Picks up" ?? I have played many match play and or alt shot when there is a conceded putt and have never seen the "glitch" happen? Is this something new?
Yes and no. The original bug way back when (years before you joined up) affected all the modes of play and then was fixed. It used to be so bad that players would say don't cc a putt if it ended the hole.
This version of it appears to affect only games where 2 players are playing and only after the previous hole was finished without actually getting the ball in the cup, i.e. cc or pickup.
I haven't seen it in AS (yet) but haven't really been looking for it. Shots off the tee that go weird usually get attributed to your basic wtf moment or the clash. :-D