With a HARM fired at an active target, if you elect to SJET the remaining HARM, it in actual fact, launches rather than falls away in SJET. It then just flies off into the wild blue yonder.
This was tested in the latest 2.5.6 stable version, but was initially seen in latest 2.5.6 OB version, with exactly the same results.
HARM SJET Issue.trk