There are differences somewhere, because every time I've had an opponent forfeit during a showdown I was allowed to just continue on my own,until my 3 holes were completed.
I play 100% of the time on my phone,which may make a difference.
My issue is the same as many. I get the automatic bogeys when the game freezes, and can't continue.
That happens very often to people in showdowns.
I have been able to get a stroke back here and there in situations where my opponent makes a long birdie putt as I'm waiting to try mine.
On the final hole that has given me a birdie on 3 occasions where I probably wasn't going to make my own birdie putt .
The game giveth, but it seems to take away more when these things happen during showdowns