Yuup, my Strom did it and my Tenere does to. I do not like it and avoid doing it.
Clunk means impact in the gear box pure and simple.
To avoid it, you can do a few things. Double pump the clutch right before the shift from N to 1. Leave in gear as much as possible and use the clutch while waiting at lights (it is much safer anyway). And when my bike is warm, I stick it in first before I start it, then pull the clutch in before I thumb the starter.
Yes, some OCD people avoid doing it. Sorry, it is a disease. Therapy has not helped me.
"If its not broke yet, it can still be fixed"