[1.58] Found some damage calculation bugs

I've found some bugs occuring with damage resistance and the penetration percent in DamageTypes.txt while doing some tests for my mod. Does anybody know more about them (or similar bugs)?

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1. Bug (or probably feature):
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The Damage from "Armor Type X Penetration Percent" does not go to structure or the next armor level. Instead it counts for the next armor plate of the same type.

Example:
Number of Armor Types := 1
Armor Type 1 Name := Normal Armor
Armor Type 1 Penetration Percent := 20
Armor Type 1 Damage Percent := 80

Now we have 2 Ships. Both will get 100 Dmg of the type above. First ship has one armor plate. Second has two.

First ship will get 80 Dmg to armor and 20 to internals. => Total 100 Dmg

Second ship will get 80 Dmg to armor 1 and 18 Dmg to armor 2 (98 Dmg total to armor) and 2 Dmg to internals => Total 100 Dmg

Perhaps thats a feature...
but now comes the really strange stuff:

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2. Bug:
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Same example as above. But now the armor provides 10 Points damage resistance.

Ship 1 will get 57 Dmg to armor (thats nearly (100*0.8 - 10)*0.8 => the Penetration Percent is added twice!) and 18 Dmg to internals (thats (100-10)*0.2 and seems correct). => total 75 Dmg

Ship 2 will get about 57 Dmg to armor 1 and about 5 Dmg to armor 2 (total of 62 Dmg to armor) and 1 Dmg to internals. => total 58 Dmg
That's maybe te following callculation:
Armor 1: (100*0.8 - 10)*0.8 = 56
Armor 2: ((100-10)*0.2 - 10) * 0.8 = 6.4
=> 62 Dmg to armor
Internals: ((100-10)*0.2 - 10) * 0.2 = 1.6

And thats defenitly a bug. Either in the mod documentation or, and for me more obvious, in the code calculating the damage amounts.