Med/Ammo Crates Keep Falling Through Building Floors

I play Support and have tried it these places:

Twisted Steel - Bridge
Rotterdam - The Docks (the small walking paths at the water)
Fjell 652 - On the defense boxes we can build
Arras - On the floor inside the church at the tiny backroom next to the altar. At the house just south of A (2nd sector)

It's super frustrating and making the ammo crates completely useless.