I was testing a new ship design, which used only cannons for turrets, but had both cannons and missiles on the main ship weapons. I was in single-player creative mode. I put god mode on myself and then spawned in some custom pirates. These custom pirates had turrets and other attached entities. After firing at them for a while, I was able to put the main entities of each pirate into "overheating," but when their turrets and other entities came off, the cannons and missiles on the turrets and main ship stopped doing any damage to them. I could still see damage indicators, but no actual damage was being done.
So, I recreated a new world and tried the same experiment, with the same result. I tried restarting the game, and the entities were still impervious to damage.
I have included a link to a starmade dock thread I posted about this, to include images.
Thank you!