Client doesn't see projectiles until server looks in that direction

I have two player characters. They can both shoot little spheres. One is a client one is the server. The players spawn at a good distance when the game starts (about 150m).

When the client shoots no projectiles are spawned or seen from the client viewport, initially. If I spin the server guy to look in the clients direction suddenly the client can shoot and see the projectiles. If the server guy looks away again the client can still shoot.

It’s like the gun is turned off till the server looks at it. Then if I run the game with a dedicated server no one can shoot – ever.

What’s going on?