It appears from other posts that WGT does not consider this a bug. To me it seems like a matter of degree. If you have only a little fringe to go through, it seems that hitting 15 feet for a 12-foot putt, as in Willy's example, should not get stuck. But if you have, say, a ticklish 8-foot downhill putt on Oakmont through 1 foot of fringe, and you hit it with 5 feet of power, it should get stuck in the fringe. The consensus seems to be to putt from the fringe only if there is less than, say, half a foot of fringe to go through, or it is a long putt and the proportion of fringe is trivial compared to the overall length.