Just stumbled onto this thread after a quick search. I know this thread is a couple years old but hoping you can shed some light on what you found out.
My 2015 JK 136,000 miles - original owner, original headlights - did the exact same thing and I noticed the bulbs were melted in the exact same pattern as yours AFTER picking it up from the dealership. Also had taken it in for an evap code, engine light and gas cap message.
Hopefully someone can shed some light on this? These can't be the only two JK's with this issue. I have no idea how the dealership could have done this, but it is awfully coincidental...
Side note; dealership said a valve was sticking and my left head needed replacement as well as some evap sensors and gasket. $7,800. So now it is sitting in my driveway while I contemplate next moves.