At around 45 mins a DGun walker tried to fire at a scorp near the top right hill. It missed 5 times. I also had a Dgun walker that missed a scorp earlier in this game.

Oops.

When I fixed the hitbox I forgot to check the aim point and unit centre was sensible.

I'll fix that when a have a spare hour or two (so likely the weekend).

EDIT: The Ultimatum is (and always has been) firing at a point below the Scorpion, so when the Ulti is at a lower elevation its shot passes harmlessly through the Scorp's legs (previously it would have hit the giant spherical hitbox).

EDIT2: PR made: https://github.com/ZeroK-RTS/Zero-K/pull/3756