Guard Not working against AST+DRK?

I used guard BEFORE the DRK jumped on me as a Melee Job, I wasn't lagging or anything because this happened 5 times in a row and got instantly deleted as I got hit by 8,000,6,000 and then Eventide hit me for 24k everything while guarding.

Is this a bug or something? because I keep seeing threads about DRK/AST meta.

Good old server snapshot. The server saw you get hit before it saw you hit guard.

If the player presses the button before you presses guard, it will go through.