we just found the issue:
Normally, if the radar burns through the jam, launching missile should not use HOJ mode but normal one. After burn through, the distance can be measured, then pilot can launch with loft (that's also how we implemented it)
However, in ED's amraam scheme, if the target is jamming, the missile has to use HOJ mode no matter the radar burns through or not.
otherwise, the missile will not track the target.
We've reported this issue to ED.
Also, we've made a walk around solution for this.
But we still hope there will be an official enhancement and solution from ED.