Music Kits ignore each other at end of match

[nightsky30]

Your system information

• System information from steam (Steam -> Help -> System Information) in a gist: https://gist.github.com/nightsky30/3983883c47bb266b9bc4d3538490894d
• Have you checked for system updates?: [Yes]

Please describe your issue in as much detail as possible:

Music Kits ignore each other at end of match. I placed 2nd in arms race, and my music kit played the end of round waiting music while the 1st place person's music kit played its victory music as it should have.

My music kit should have been muted and waited for the 1st place player's music kit to play its victory music before becoming audible.

Steps for reproducing this issue:

1. Have a music kit
2. Play another player with a music kit in arms race
3. Let that other player win so their music kit plays at match end
4. Notice both music kits play at the same time (sounds awful)

[nightsky30]

Perhaps this also has something to do with #1872