Acid vs Armor Modifications Options

[Sendaz]

So Acid attacks reduce the Armor value on a piece of gear.

So if someone had Armor Jacket (12) on which they splurged for a full 12 rating Nonconductivity was hit with a magical Acid attack, it would be safe to assume the Jacket drops to Armor value 11 and Nonconductivity 11 (acid chewing up bits of the non-conductive parts and such).

However if the person had gone with Armor Jacket (12) and only spent on 4 Nonconductivity, when they get hit with the Acid attack would the Armor now be AV 11/ 3 Noncon or would it be 11/4 and not start chewing into the Nonconductivity until it was the last 4 points of Armor seeing as the armor still has plenty capacity to house the modification since Armor value affects Capacity of said armor for things like armor modifications?

I can see arguments either way, the former because the acid is eating off bits of the overall armor, while the latter is supported by the capacity rule.

It gets a bit muddier if the person has two or more armor mods like say the jacket was 4 Noncon/4 fire resistance. What order would they be decreased?
Chew through all of one then the other or alternate between the two so 1 point off Noncon, next point off Fire and so on....