Heavy Gunners (donated ones) decided to attack dead construction (it was down even before their deployment) - outhouse in this case (didn't stuck on it though):
It's also annoying that HG likes to fire at walls when he could simply walk 5 meters to the left and enter through the giant hole the other crew are using. An X-ray of Heavy Gunner brain detects the problem.
We're aware that the Heavy Gunner is a bit slow on the update compared to the rest of his crew. He's currently go through remedial classes to improve his targeting and route finding.
I just had the worst battle playing around with them :/ One of my WD Ran away from HG group to heal a gunner clearing side islands HG kept attacking dead constructions. At one point, they switched targets from a dead building and two HG fired from double range to hit the same target as several other HG were attacking.
Here's another blatant example of the HG bug. In the screenshot below you see my HG swimming to an outlying island of rubble. He swam all the way there before deciding to join the battle. Needless to say, I lost the attack, due in part to this bug.
Lets see, last battle against Floki, HG's start out shooting a destroyed building, then carry on and instead of walking through either of the two openings I had opened, they decide to destroy two walls. SMH Not only were they idiots, but they locked my WD in that position until they destroyed both walls.