[edit] I cannot claim all this information as my own, and am quoting people who have contributed so this list is only as comprehensive as it is because of their contributions.
I keep finding out bits of information here and there of snippets of things that don’t work properly. Recently for me it’s finding out that Off Balance might not work properly.
I’m trying out different builds but it’s all up the swanny river if I’m using things that don’t work. I’ll try and edit the first post with a list of things that are broken. Help me out here! I’d rather not be dragged into the whole business of “beam staff proc’s on first hit major problem it’s broken” And I want things that are actually not working as intended. I’ll update anything that has been confirmed fixed in patches as I simply don’t know where we’re at now.
Sienna
BW
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Rechannel does nothing on Beam Staff and Bolt Staff.
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Voracious Conjouring does nothing on Beam Staff and Bolt Staff.
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Rechannel desn’t increase charge anim speed but I think it gets you to overcharge faster wtih Fireball
Staff. -
Tranquility passive breaks when you dodge a hook rat.
-
Ultimate ground effect does cause damage, but won’t show on your damage numbers as it is the same damage type as “barrels”.
UC
-
Volcanic Body not working when playing as a client.
Acknowledged -
Unstable Strength only stacks up to 3, not five.
-
Dissipate doesn’t work as client.
Saltspyre
WHC
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Eternal Guard talent not working when playing as client.
Acknowledged -
DeathKNell doesn’t increase damage of critical headshots.
-
Witch hunt passive is the same as Off Balance trait and they don’t stack.
BH
-
Leave None Behind talent not working.
-
Necessary means you can proc scrounger at will with your last shot.
Z
-
Pleasure from Pain weirdly broken. Use special ability and shoot something and while still having the special ability and the target is still alive hit it with melee weapon.You now heal from every auto attack until the end of the game and you get twice the healing when you use the special ability.
Ackowledged -
unswerving strike does nothing. HEavy attacks can still be interrupted by damage.
-
No surrender not working as client.
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Holy Crusader not working as client.
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Fiery Faith grants 5% power for 25 health lost only works on base health unmodified by other things such as health trinkets/necklace.
Kruber
FK
- Glory Hound only works as host.
HS
-
Hunters Respite grants Temp HP instead of HP?
-
huntsmans passive and conservative shooter don’t work together and give the right amount of ammo on headshots.
Bardin
IB
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Oi Wazzok Works on host, but not as client.
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Rune Forged Recovers temp HP but description says HP, and this can also get triggers by FF.
RV
-
Rangers Catch A Breath grants Temp HP instead of HP?
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Survivalist ammo can push any players ammo over and above their usual maximum, up to one magazine’s worth of ammo extra.
SLAYER
- Crunch! talent only increases stagger in the keep. No affect in mission either as Host or Client.
Kerillian
WS
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Arcane Bodkins works as host, not as client.
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Ironfeather Flights only works as host.
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Daughter of the Hunt talent does not increase the damage of crit headshots by 30% but doubles the difference between non-crit and crit damage.
HM
-
Handmaiden’s lvl 25 talent “bladedancer” doesn’t seem to be working as client. As host, it does. With one chaos and infantry stack on charm, it kills marauders with one charge with 3 bleed ticks, each dealing 13,5 damage. Doesn’t kill marauders as client.
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Ariels Benison passive doesn’t work.
EVERYONE
You get 0.5 
for every proc of healing (real & temp) as long as you are below 50% of your max . The amount of healing does not matter. [from any source]
So this effect is stronger If you get may procs.
This makes temp hp on kill an even better pick that the tool tip indicates and breaks pleasure from pain even more as you can do infinite pushes with it.
*off balance, Witch hunt, Crippling wounds and Make em bleed are the same debuff and don’t stack or refresh.
TRAITS
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Barrage transfers it’s damage increase to melee hits as well? [intended?]
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hunter transfers its bonuses to melee hits.[intended?]
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Off Balance Not working as intended. Doesn’t stack with some characters debuffs (Slayer and HM?)
*Off Balance increases the damage by 20% for five seconds instead of 50% for three seconds. -
conservative Shooter doesn’t work for the first shot with a handgun, and this trait can stack randomly.
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Conservative Shooter doesn’t work at all as Bardin?
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resourceful Combatant and resourceful sharpshooter reduce cooldown by 2 seconds rather than 2%
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heat sink doesn’t always work on armoured enemy body shots, even when crit does damage.