Brute lightning field taunt IO bug?

I can put a taunt SO in lightning field, but I cannot put built invention pieces of Triumphant Insult in it (a taunt IO set). Is this a known bug?

That's working as intended.

When inventions were first added to the game, we could use Taunt Sets in auras, but the procs would affect the player character, not critters. In other words, a damage or stun proc would damage or stun the player. The devs just removed the ability for Taunt sets to be used in those auras.

Click for Hot Sun Splitter Action

You should be able to put a Standard Taunt IO in the power, but not a named IO Set. They just recently took the ability away from Invincibility (Invulnerability Powerset) as well.

You can see what enhancements a power will allow by mousing over the power name in the Enhancement Management screen. Standard Enhancements, and IO Sets will show up in separate categories. You will see Taunt as an allowed Enhancement, but Taunt sets are not allowed.

On a side note, my tank slotted [Perfect Zinger: 20% Chance for Psionic Damage] into it before the change, and the proc fired onto the foes normally. I also have a BuildUp proc from a ToHit set in the same power, and that fires normally as well. I am not sure which procs caused a problem or why they removed the ability to slot the Taunt Sets. I love mine.

Luckily for me, the set and bonuses still work just fine even after the change was implemented... as long as I don't respec that build. haha. I also have 2 other items in that set, which gives me the 2.75% Fear duration reduction and 10% Regeneration bonuses from the set.

Yeah. I put the 'chance to disorient' from an END set, which actually works well for my fire/ela brute to give a 'little' damage mitigation. I then realized that there is another disorient proc set in taunt, got my hopes up...oh well.