game #37698260 on oregonTurn 11 (v. 2 bots) -- I ended my action phase using my final action to play Village Green, then selecting to defer it until the next turn. In my buy phase I bought Cavalry, assuming it would return me to my action phase. It did not. I then went ahead and tried playing VG undeferred, after which buying Cavalry returned me to my action phase as expected. I just ended up resigning after playing VG so you can choose both options to hopefully easily reproduce the bug.