You do not get a warning if you place armor HP contributing blocks on a ship that has damaged armor HP
You get a warning if your Structure HP is damaged, so you should also get one for armor HP (if you place armor HP contributing blocks)
to reproduce
- place hull blocks on your ship
- use entity_set_armor_hp_percent 0.5 to damage its armor HP
- build on it => you don't get a warning that your armor HP is damaged