Loose all Sacred water possible bug after Zarokh fight

After you finish the fight with Zarokh and enter the reward room the sacred water shown is the amount only gotten from the fight with Zarokh, however if you go to the shrine to replace all your remaining water for keys you still get a significant amount of keys (like that the current amount isn't correctly taken into account)

I got 2 silver keys with 5 sacred water left and yesterday I got a golden and silver key after the fight when I first noticed the possible issue.