Enchanted Daggers hit SO Fractal boss
You can even use a dark field and projectiles… taddaaa: Life Leach. This is known for long.
Always kill all the Jade Colossi (fully complete the bar to get the fight into Phase 3) before doing anything that damages the Jade Maw (life leech).
Being able to life leech the Jade Maw is a very good thing. It allows you to slightly shorten some of the insane snoozefest of a time gate that the fight is. Life Leech its self is unlikely to even be a bug, because the boss is only supposed to be immune to physical damage and conditions, anyway. The bug is that the boss bugs out when you do it.
The only downside is that you can’t life leech in Phase 2 without risk of bugging the boss, thus shortening the snoozefest even more. Waiting for Jade Colossi to spawn so you can mow them down with trivial ease and repeat the process over and over again is not fun. Hopefully, ANET will not fix this bug (should a fix ever occur) by making life leech ineffective against the boss.