Hey there! You will still get Season of the Hunt. There was an issue where first time purchasers of Shadowkeep or Upgrade Edition did not receive the current season pass. Upon fixing this issue, this led to other users receiving the current season pass for free.
No way! I just randomly clicked this thread because i was scrolling through looking to try and help people, but i got this season for free for some reason too, and I have been wondering why every since! Thats so cool hahaha!