Point being these Graboids aren't targeted by Luciferin. Since they are untargetable I find that no surprise. Just like using Quintessence and then Luciferin has a different effect than doing it the other way around (although that at least gives them the immortality ability). 99% sure it's not a bug. The Graboid deja vu not being a new Mutant is, but that's already confirmed (since Quintessence and Burrow work the same way).