I think I have a theory Many people say that(I think that how you spell her name) Yae Miko is the past Archon so... Maybe the gnosis is with Yae and not with Baal. So maybe when we hang out with Yae, her gnosis will get stolen
Actually, according to lore, Baal gave her gnosis to Yae Miko and told to keep it safe, Yae gave it up to scaramouche (wanderer) as it does not belong to her and baal doesn't need it to be powerful.