I posted the very same thing on bug forum. I can verify this does happen. it happened twice to me earlier. I was leading by 1 shot on the final hole, and on both occasions (different opponent) they disconnected whilst on the final green after just 2 shots.
The game was awarded to them after I putted out even though they failed to take any putts, and the scorecard recorded them as shooting an eagle 2!
We both were on the green in 2, the difference is that I played out the game, and got a par at the end and my cheating opponent was awarded a fake eagle.
its clearly a bug, it happens every single time so is easily repeatable, so should be fixed as a matter of priority I would imagine. Its just a shame that so many people in such a short space of time, should think it is acceptable to cheat.