Visible tracers, no plane

[J2_Bidu]

You're flying, then you see tracers going from one place to another. But there are planes on neither.

This is probably know already, but I didn't find a previous bug report, so here goes. I also remember a similar bug from Rise of Flight.

 

I have the flight track for this, so I confirmed what we already suspected: there are no friends or enemies around (except for my perplexed wingman, J2_Jakob). It was recorded in multiplayer last night (on Jasta 5 Flugpark).