I have a 2021 Rocket due for its first service, however I have noticed more than a few times the engine dies when changing down coming up to traffic lights etc, starts no worries, but is a bit of a worry. The bike idles quite well normally.
maybe some adjusting needed with the clutch, maybe a software update... due for its first service, point that to the services guys, they should be able to take of it under the warranty....