not sure if this was left out or just an over site.
ammunition does not appear to drop from broken crates at all or at least so rarely i have yet to encounter it
It’s most likely forgotten, or the level designers decided to make it harder by adding less minor items.
The game uses a different engine, the complex is bigger, the button under the guards desk isn’t suppose to be there, the crowbar didn’t appear when it should, etc etc etc etc etc etc…
This isn’t an exact copy of the original nor is it suppose to be. It’s a “modification”. Little stuff has changed.
Crates do drop supplies, just not every single one.