Yes, toon is a gnome and currently at 465 skill level. No 3rd tinker. Going to try a few stacks of bolts to see if it just shows, but that's the first time on 3 gnome engineers that it didn't discover prior to 465.
Just had a strange experience, just finished leveling from 390 to 465 and only got 2 tinkers, 1 at 245 (cardboard crap) and 1 at 255 (spinal). Nerf? Bug?