On Android, I attempted to open a gold chest with gems. I had 300, it required 300. Unlock showed green but when clicked, took me to gem store with message that I needed to “buy 0 gems” to open the chest.
Did this occur on the post battle screen or in the Chest vault?
Attempting to repro myself, so far have been unable to on the chest Vault.
Has this occurred since your post? If so, are noticing it with one type of Chest or multiple.
Jeto - Support Human