I was just playing my final round of the current showdown. I was at -1 after the first of the 3 holes on Erin Hills. I put my approach to 1yd on the 2nd hole, and the twat of an opponent quit. I got a popup saying something unexpected happened, with CANCEL and RETRY buttons. I tried the RETRY a few times but nothing happened, so all I could do was CANCEL. The game closed down, and after restarting it I found that it had given me a birdie on that hole... and then a par on the last! it didn't even let me play the hole!
So WGT, the bug still exists, it has not been fixed. Yes, I didn't get 3 bogeys like used to happen, but I could have been 1 shot better off, particularly as it was a par 5 and an almost certain birdie. The only way to fix this problem is to allow single player play in Showdowns. It really is pointless making it multi-player because multi-player has nothing to do with Showdowns.
EDIT: For my last 3 holes it has given me the same 3 holes on Erin that I've already played (those mentioned above, that's how I know it was a par 5 it hadn't let me play first time around).