I'm sorry you had trouble with that. This was likely done by an environment artist who was detailing the map, noticed a 'good' spot to stick a crate, and shoved it in there. I guarantee it was not done in some intentional, malicious way to trap you there. While someone should have tested falling in there, and getting out, that may have been overlooked.
Either way, it doesn't matter. If I can find the map for this I will fix it. Can you please describe further where this is located specifically?
Are you sure? Maybe he was laughing while he was doing that.. but anyway if i remember right. its in the big room with the ramps... plus on that map.. it seems like the floor disappeared like we are walking on nothing. its just black and darkness.