It is not a bug, mods designers specialy create this function of acid.
In description they write that this function were made because double damage for augmented parts were removed, but it is wrong description.

引用自 Khelavaster76：

I know this is a bug in the vanilla version but is there anything you guys can do to fix it or modify it in any way at all in your mod? Total bummer when the acid creatures start to spawn and then you gotta ditch the wheels entirely (no pun intended).

Are you referring to
1) issues with Kaos Buggy with spiked armor equipped, or
2) vehicles getting parts disabled when taking damage from acid?

Issue 1) is Vanilla bug, it will be fixed in the incoming BetterVehicles rework, which will be part of 1.0 release (we are about to start the closed beta on that)
Issue 2), that is intended; if a vehicle part takes damage from Acid (that is, the acid eats through the armor and manages to reduce the HP), that part will be disabled for a turn.

Thanks for the reply Voland. I was talking about 1, i wasnt aware that it was the spiked armor mod that was causing that issue. I wont use it anymore until 1.0, thanks again.