Error particle appeared mid-game:

[Yuppie Guy]

So, I played Deadlock players VS bots gamemode, and in the middle of the game this error particle appeared. Suddenly, I forgot to take a screenshot of console and I can't tell which hero did this, but it looked like someone used ability and in result this particle appeared.
Also, in the right corner you can see ID of the match I played.

 

[Lady Briar]

Related: https://forums.playdeadlock.com/threads/major-graphical-glitch.30484/