tyorotyorooooo If I am understanding you correctly, your last ranked match didn't count due to the season entering its second split.
While strange as that is, I don't believe that this is a bug since everyone's ranks does get a soft reset when entering a new season or split, (which the switch to Season 29's second split may had gone into effect during your last ranked match).
However, if you believe this is a bug, can you please provide screenshots, (or videos), of your last ranked match so the issue can be looked into?
Note: I cannot guarantee that you would get your ranked points awarded if the issue was caused by a bug.