This is happening to me as well. I've restarted the game and it goes away, then it comes back again. I have also noticed it when re-arming mines and mystic mines - there is no animation.
Also noticed that when the game is in a state of not drawing / animating resource collection, the Mystic Mortars become not so mystic (circles stop rising from them). Probably have a memory leak somewhere stopping the game from drawing more stuff on the screen
The fountain stops animating water and Firetop Mountain goes dormant from the same bug. I think the dolphin statues stop blowing bubbles as well.
Also, my Stronghold (PH5) that gets 1.6M each resource (new one from PH9 update) is defeated but shows itself as standing. An the one next to it (old one) which I have not fought shows as destroyed but with a Fight button over it.