Don't worry, you might not have seen it, but you got the contents of the chest
TLDR: Chests are awarded automatically into your account the moment you tap on them, even if you don't see the animation.
The game was designed in such a way that when you tap to open a chest, the 'client' (this is the way to call the app in your phone) sends a message to our servers saying that it needs rewards for that chest. The server then deposits into your account the gems, coins, items, and hats that you should be getting (according to the chest type). This all happens on our servers, since your account and all registry of it is safely kept there. The server then sends a message to the client to show the animation of the chest and the contents that were awarded.
So when you tap on the chest, if doesn't matter if the phone closed, crashed, ran out of battery, was abducted by aliens, or your friend distracted you from seeing the animation, the contents of the chest will always be there :)
If you can't immediately see any changes, you can always do these things to refresh the information on your client from the server:
- Switch planets
- Play and finish any level
- close the app and reopen it