I saw this post today on revealing the hidden MMR on ranked games: https://www.reddit.com/r/VALORANT/comments/kjoyqd/there_has_been_a_ranked_point_checker_to_see_how/?utm_source=share&utm_medium=web2x&context=3

I went to try it out and noticed something interesting:

{

"MatchID": redacted,

"MapID":"/Game/Maps/Bonsai/Bonsai",

"MatchStartTime":1608783064497,

"TierAfterUpdate":16,

"TierBeforeUpdate":16,

"TierProgressAfterUpdate":23,

"TierProgressBeforeUpdate":28,

"RankedRatingEarned":0,

"CompetitiveMovement":"STABLE"

},

This game was a draw game but I actually lost 5 points of MMR from it. Obviously it probably won't derank you or anything (most of my win/loss games affect MMR anywhere from 20-40 points, where you need 100 to rank up), but it's definitely a deviation from the rule that you don't lose ANY MMR if you draw.