I finished Season 3 with Master 5 and I received the rewards for Platinum 1 (Not even diamond) . And I only got 800 competitive points when I should have gotten 1000 or even more.
I also received the Platinum Challanger title.
I also have a friend who didn’t recieve any rewards at all at the end of the season and he played competitive games too!
The Devs have acknowledged this bug: Overwatch 2 Known Issues - April 11, 2023. However, we still need to keep spreading the word about this bug so that they actually fix it unlike the bugged career profiles and missing end-of-season rewards from other previous seasons like Season 36. Here is a link to my post in case you would like to read more about this issue: Comprehensive Thread Of All Top 500/Competitive Bugs. I’ve compiled a list of posts regarding similar bugs under: Incorrect End Of Season Competitive Rank And Rewards (Seasons 1-3). Please help in spreading the word about this megathread and other related threads, we must demand the Developers to give us the rewards we rightfully earned.