After fighting a goliath it appears it is taking no damage after vetting a couple ranks. I had 5 gcs on it and it's health didn't change. Also tried a nuke direct hit still nothing. It only lost a couple thousand hp after i hit it with an artemis which it promptly regened. It's not the regen that is bugged, it seems to go up at a balanced rate. It's like it has a near 100% armour value or something, I have no idea. This is v13 btw.
Here is a gif of it vs the gcs >>> https://gyazo.com/71cba14cc3635ccb25d4ecd0aa59088a