Open Beta
pg.91:Firebee
Firebee does not inherit any of the WAM-B's quirks, which were: Difficult to Maintain, Extended Torso Twist, Non-Standard Parts, Poor Workmanship, Weak Legs.
If the loss of negative quirks can be explained by switching from the prototype to a mass-produced variant, and Poor Life Support could be picked up accidentally in the same process, the question still stands: where did the Extended Torso Twist go? Visually, the chassis did not change a lot.
EDIT: WAM-B is in the XTRO: Primitives Vol. III