The Wing suddenly not-starting-in-gear happened to my 2008 GL1800.
It became an aggravation as sometimes on a quick pullover stop it would not start in gear and would not readily shift into neutral so that I could start it … had to really work with it while everybody else was pulling away…
It got to where I would shift into neutral at a stop before I turned the key off and hope I was in a position that it would not roll… usually would put it in reverse if I was going to get off the bike.
It had a new battery.
Even though the mechanic said there was absolutely nothing wrong with the micro-switch on the clutch I had him put on a new one.
Still would not start in gear..only in neutral.
He turned the little silver tension dial on the clutch lever such that it allowed for a more firm “pull” on the clutch…ie…a better contact… THAT DID IT!!
I had always had it set on the easiest tension pull for my hand. No more problems after that with starting in gear. Something was not making contact as well as it used to in that clutch lever.
Your 2017 Wing might not have that little silver dial with numbers on it but I betcha its something in that clutch lever not making contact as well as it used to.
It’s a no-cost thing to try anyway.