You have to restart the game once you get thrown back to the race select screen during matchmaking, before warm-up.
In fact, you have to restart the game every 2 races not to get the bug. I just got it again pushing my luck with a 3rd race in a row.
It has happened! Once in a blue moon, a full blue room.
Still not penalty free, perhaps when blue pigs fly.
And it couldn't last. Next race I get squeezed to the wall by another car trying to overtake after the bridge. Unfortunately I was fixated on the radar to avoid him and tapped the wall just before he tapped me, so I ended up with a 5 sec penalty. I called him out after, he blamed me of course. Said he was as far to the inside as possible (not, showed him the screenshot, he ignored it) and started cursing me out for inexperience. So I blocked him, bye.
Meanwhile I got that dc bug again, so now waiting for the next race. I lost 2 SR that race as another car ran into me earlier for another 2 sec penalty while I actually was fully on the inside (different turn)
One more race, don't want to leave on a bad note. Race loaded, he's not there