Autumn Classic Challenges Glitch-Second Half Not Unlocking

I’m having an issue with the Autumn Classic challenges in MUT 26 and wanted to see if anyone else is dealing with this.

I completed both sequences (Fall Fest + Harvest Heroics) and got the Tier 1–3 milestone rewards, but the game says the “other half of the challenges is available” even though nothing new shows up. There are no more challenges to play, but Tiers 4, 5, and 6 stay locked. 

Let me know if you guys have similar problems.