scoresby: According to WGTNiv's response above, "freeze the instant they strike the putt. The putt still counts (miss or otherwise)"
I misspoke. After some further testing I noticed the freeze only occurs if the putt to halve the hole was made (and only on the last hole of regulation or sudden death). If the putt to halve is missed or if one player just wins a hole outright the game will play out as usual. If no sudden death is needed or if it's not the last hole of regulation you will not see this happen.
scoresby: If the putt went in on the last hole of regulation or sudden death then it's likely your opponent did not see it either, otherwise we wouldn't have the bug. In my tests neither player saw the putt at any time.
lcf: Unfortunately, yes, this does count towards the 3-disconnect rule.
I've followed up with our devs since the initial report and have been assured a fix is being worked on as we speak. I might recommend avoiding match play games (at least the ones for credits) for the next few days while we can get this problem sorted out. If avoiding is not your style at least be aware of the issue so you can offer to drop the match at the appropriate point before any disconnection penalties kick in. For the time being you may wish to only play with your friends or those who would be willing to abide by a "drop match" rule should it get to that point.
I'll be sure to follow-up once more and let you guys know when it's fixed. Thanks for bearing with us on this one.