Camera not working after build/ multiplayer

Hi, I have only one camera prefab 2D, whenever a new player enters the game, the camera will follow that player. Everything works fine when I test it without making a build. Every time I hit the build button, it stops working after that. Is this unity bug or am I doing something wrong here?

I am using mirror, if it matters. Thank you.


EDIT: Somehow there was a second camera on some random object and unity build forced the the script somehow to detect that second camera instead. Strange, but fixed it.