There is still a known issue where a team of all solos matched against trios may not receive loss protection.
While these matches are rare (less than one percent of games for solos), we have modified our matchmaking parameters to further reduce the likelihood of these matches occurring while we continue to investigate
how about just make that a permanent change?
the only acceptable excuse for these matches ever happening is "there is literally nobody else in the player pool, so we have to match a trio against solos"
(admittedly I sometimes enjoy these matches, and with loss protection they're either a free win or 5 mins wasted, but on principle they just shouldn't be a thing)
That is already the only way those matches occur. There have to be no other duo or trio teams to match against for a period of time before it will push a trio against solos.
And we increased that time restriction today, as mentioned in the patch notes.