breaking gifts and vases in ops mode

Same with Rescue champion on graveyards ops. Last plant doesn't spawn and graveyard ops can't be completed.

I have a similar problem. In garden ops I break all the vases but one or two of the zombies won't appear so I can't complete that wave or the game and there's no way to reset it.

When this happens, have everyone commit suicide to restart the wave using a team save. This isn't a perfect solution but at least you'll be able to finish the ops and get the coins, especially when its an enchanted. 

Wow, I wish I had thought of this the many times this has happened to me and to me and my son when we were playing together!  Clearly since I'm having this issue now and everyone else reported this a year ago it isn't going to be fixed anytime soon.

It's a glitch that pops up every now and then, very frustrating but rare in my experience.  It hasn't happened to me for a few months.  It's sometimes known as the "wave 8 glitch," because that's when it happens.  It can also happen with other challenge waves like checkpoint race.

An ex-popcap employee admitted once on the reddit that it was basically his fault, lol.  Something goes wrong with the counter that keeps track of the number of enemies.

The suicide option is the only way to finish the game.  If you're playing solo ops, you're out of luck, since you can't talk the AI into killing themselves.