Corrupted Carapace - why macro not working!?

So I have this makro and others with a similar "/equip"-line since aeons. This macro works with every possible shield out there.

Just not with Corrupted Carapace - is there some internal error, for example that the items name is not spelled right (code) and thus far the macro-function does not recognize it as that particular item?

#showtooltip Spell Reflection
/cast [stance:1/2,equipped:Shields] Spell Reflection; [stance:3] Defensive Stance
/stopmacro [equipped: Shields]
/stopcasting
/equip Treachery's Bite
/equip Corrupted Carapace

Is the macro.

Can anybody help out?