CSR-penalty for non-existing game?

I lost almost a full Arena rank yesterday for quitting a slayer match.
In fact everyone from both teams lost almost a full rank für quitting a slayer match.

Problem is: That game never happened.
After a slayer match on Mercy the game summary took longer (maybe 10 seconds) to load, which can happen sometimes.
During the loading time I heard the “3, 2, 1” Sound, then the game summary showed normally and the normal Player search for the next match (Fathom) started normally.
I later found that, according to my Service record, the Servers recorded another slayer match on Mercy where all 6(!) Players from both teams left simultaneously after 5 seconds.
That game is supposed to have happened during that 10 second delay for the game summary (which would have been within the normal pause during matches anyway).

Can someone look into this?
I thought the last maintenance update was supposed to improve Server telemetry.
I seriously hate working on my CSR and then getting a day’s progress ruined by a glitch.