The titan is supposed to turn invisible! If you look in the entity files for the ability the buff BuffUnyieldingWillSelf activates BuffUnyieldingWillRecourse when it is about to die, which then after a delay time of 3.000 activates BuffUnyieldingWillInvis, which then applies the entityBoolModifier IsInvisible, turning the ship invisible.
So there you have it, the Eradica Titan is apparently supposed to turn invisible. It actually isn't a bug.