I've seen that before, people say it's happening when you go noclip right after you are eliminated.
Just on the newer build, or has this always happened?
I fixed the names not showing up when you put your crosshair over somebody. Haven't uploaded this fix to the server yet. The trace was hitting the interpolated hitbox, so names would only show up if people are coming toward you, not moving away.
(now it gets the owner of the interpolated hitbox)
Edit: Trying to figure out how I got a crash with some negative value for skinnum now.
Edit: And zuluzet gave me some code to hide player entities when you're inside of them. It works, but the sound doesn't play correctly (I guess the position isn't getting updated). Trying to figure that out, too.