Possible Bug - Lantern Archon

[Nightshadow]

The Lantern Archon (2nd level, Celestial Summon) may be bugged. Its lightning bolt attack deals only 1d6 points of damage, and I've a feeling it's because of that update that put all (or most) summons HD down to 1. Their lightning bolt's damage is likely based off their HD, meaning with it now reduced, the thing only deals 1d6.

Is this a bug? If so, can the damage be increased, please?