mega1byte: The stick is in unless you remove it, but when on the green it is shown but doesn't allow the effect you are looking for. you can't putt and hit the stick.
+1
mega1byte: Flags are always removed once all players are on the green..
That's not a rule in itself but a way of agreement between casual amateurs to play the game, in compliance with the old rule until end of 2018.
mega1byte: I think there is a new rule in golf that allows the stick to be in as you putt, but haven't ever seen that rule used.
Yes there is, from Jan. 2019, and I've seen it frequently in the youtube summaries of PGA Tour tourneys. The commentators would mention it.