When the Breakthrough expansion was released I remember there was a bug where ammo would rarely drop when you killed enemies. I was wondering if that was ever fixed, it ruined the singleplayer part of the expansion for me.

It's not a bug, it's by design. I also don't like it, so I'm using this mod: Ammo and Health Drops

Thank you for letting us know about this mod.

That mission is such a cluster f$#k of a design.
The soldiers are bullet sponges and there is NO ammo around.
I reached the damn wooden door with over all 32 bullets between ALL guns!!!
I can some-what understand the lack of ammo.. BUT WTF is with the enemies' high resilience?

I actually raged quit the game, and looked to see if this mission in bugged with the no ammo thing.
Came across this and solution and would you know it? passed on the first try.

Also... can we talk about Klaus running like a Cheetah, but climb like a Sloth? WHY? that mission is all FUBAR in my opinion.

Wow, yeah, this level is awful by default. Thanks for linking the mod that fixes this. I was struggling to get the cheats working too; "spawn mp40" or any other weapon was throwing out a bunch of errors and no weapon seemed to be spawned anywhere near me.