So, I was kind of right.
According to The Athletic, the incident was when he got pulled against Tampa Bay, he went to the dressing room and showered with no intention of returning to the bench.
And apparently it was his teammates who made an issue of it (Atkinson, Jones, Jenner, among others) and pulled him aside before the flight.
https://theathletic.com/767688/2019/...-versus-tampa/