With high angle dives, there doesn't seem to be enough separation for Tacview to not have the bomb hit the aircraft moments after release.
I attached a Tacview file, you can see it happening at 21:22:54, 21:25:05, 21:25:35, and so on. The only time it doesn't happen is with the release at 21:23:41, which you may notice is a shallower dive.
Also, M274 rockets disappear midair after a set amount of time (21:09:36, 21:10:40 and so on), but I believe this is the smoke version's behaviour.
https://drive.google.com/open?id=0B-lTLrKHEXokcmF4dldHbzV1SHc