Slitherine

I have seen Space marine vehicles fire from 11 hexes away and hit one of my units.

• Single player game, 'Very Hard' difficulty, 3 AI players (2 Space Marines, 1 Ork, I'm playing the Guard)

• Only one faction (yellow) has shown this bug, though there is another Space Marine AI faction

• Only vehicles: Hunter, Predator, and (on first occurrence) a Vindicator

• Does not happen every turn- I'm writing this after the second occurrence, which happened 10 or so turns after the first.

• On this (second) occurrence, 2 hunters and 1 predator each fired at my Leman Russ tank (See screen shot)

Attached should be: dxdiag, msInfo, screenshot, logs, and savegame.

Never mind, I saw that's a Space marine tech- a missile with a range of 12 for the vehicles.

Yes, that's an endgame weapon, with a cooldown of 10 turns, IIRC.
Bug as a weapon, that's rather the tyranids than the space marines.