Symptom: When playing with first person shooter brain or an invisible player with a shooting weapon, after you fire and run you can hear footsteps and see dust come up out of the floor in front of you even though your player is standing still.
Cause: DLC Update
Existed since: June 2015
Solution: There is no absolute solution, but there are workarounds
1. Use a different camera set up than first person where the player is not invisible
2. Make the player as quiet as possible and use an external brain for gun and walking sounds
3. Force the player to fire once when they stop moving, which stops the effects
See
https://schoolofkode.wordpress.com/2017/10/13/phantom-footsteps-bug-work-around/