I use Agerian armor and the set bonus works fine for me.
Tried it before the maintenance tonight, the bonuses never showed up (+100HP and + 2 Atk/Cast Spd).
Tested with Lahn.
Did you check in your char sheet if you actually get the attack speed?
The UI has some bugs displaying some things.
I get all 3 attack speed from it.
Only agerian helmet does not add set bonus (translation issue)
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