If you encounter an issue when opening Chests but resources or keys are deducted, the rewards are still earned.
After selecting the number of Chests to open, if you notice the currency, Key, or resource deduct, but the game happens to crash, freeze, or encounter an issue, the Troops and rewards are earned.
The game is designed to collect the rewards even if a crash or server error occurs, as soon as you select the button the game client has told the server which rewards you earned from the chest, everything else afterwards is just a visual animation.
NOTE: Please contact technical support here if you would like us to check what you received from the Chest. We will need the exact date/time you opened the Chests and the number and type of Keys used.