Graves AA bug

So I don't actually have recording of this but I will try to get one very soon but I've been playing graves a lot lately and I've found occasionally the shooting animation and sound will occur but graves wont actually shoot, it will also count this as a shot making you have to wait to shoot again, however it wont actually use a shell.

Super annoying bug mid fight when one shot can make all the difference if anyone else has experienced this would appreciate a mention.