It's hard to get a video of this but I'll do my best and make a bug report for this. What I have noticed it wasn't my full first line though.
During the game
I went from my 3rd line and 3rd defensive pairing - changed to my 1st pairing and my 4th line (manual change during game action - so not at a faceoff draw)
- in this instance my 1st line defensive pairing game out and my 2 skaters out of 3 for my 4th line were on the ice (my first line right winger got on the ice instead - playing on the left side as well - the 4th line center and RW were on the ice with them). I have noticed this a few times and it seems to happen with the same player each time with the 4th line.
- just to make this clear: I had no injuries and when I looked at my lines in game and before I started and the 1st line right winger was only on the 1st line.
- not sure if this is intended or not but I don't remember seeing this in NHL 24 or NHL 22. I never played NHL 23 enough to know for sure.