Glitch?
My player got out of bounds somehow, no one subbed in for them, so I had to play the rest of the period with 4 players in the rink and 1 walking around outside.
Oh wow, certainly a glitch. I've had the puck get out of the playing surface, which would reset at the end of a period, but this is certainly the first time I see this! I will try to repro. Thanks for the heads up!