I posted it before that go around flaps is really applicable to flap full. It has performance issue. Flap3 to 2 or 2 to 1 is done for standardization. This was in Airbus discussion. Here when flaps are stuck between zero to two one step retraction doesn't move anything. Bu you can leave it till deciding to divert. Another issue is if you have to do another instrument approach then what? You do it with landing flap i.e.mostly 3 or retract to 2. Slat jam case it will move flap to 2. As for as diversion is concerned slat jam it asks you to retract flaps but in case of flap jam leave slat as they are. Slat/flap jam is critical during approach because with FPF 60%,80% and 180% for slat, flap, gear you aren't going anywhere. That's why only green fail looks innocuous but if weather is poor then putting gear down requires some consideration. Because you can't divert. In case of goaround would you hold for sometime for weather improvement or keep shooting approaches burning fuel needs some thought.