More often than not, her scream ability will happen in a different direction and still hit you. You can die when the fight ends prompint a respawn at a city/safe zone or wasting a crystal. abilities that should be used to dash through the boss only work like half of the time. Attacks are all severely delayed and sometimes even faster than the animations that occur for the boss. Clones sometimes prompt the insta death mechanic even when finding the correct one.

So far, I've only personally experienced the first one, and that one is common for all mobs in BDO, and a simply desync issue.

Do you have some videos of the other bugs.
For the clone one: Even if you killed the correct one, the false ones stay around for a few more seconds. Hitting any of them with an AoE accidentally will still fail the mechanic even if you already cleared it.

yea not just the yell but skills that have clear visual indicator also lie

dying after fight end also common, but have never lost a crystal

actually have the opposite problem of not being able to dash through boss- i have problem where she has no hitbox so i hit thru her and lose back attack damage + she back attacks me

Same, losing crystals is very new to me, but the lack of hitbox actually affects more bosses, I also had it on Pig King and Bari