50's "coupe/2-door sedan" cargo volume issue?

I was screwing around in the car editor last night and made something using that kinda big-ish 2 door coupe/sedan thingy from the 1950's, and noticed that it had 0L of cargo volume when I built it. I found it weird, so I went to a couple of the build threads in the car sharing forum and the first thread I came across (Yugospy's) had a build with the exact same body that also had 0L of cargo volume. I presume this is a bug, seeing as how every other body I've tried comes up with at least SOME cargo volume?