Goodbye 8th Year Event Goals Fix
A fix is now live. An additional goal, Earn 5 Stars, has been added. Completing this will grant the additional 500 RP to complete the reward track.
It was happening on WiFi but it seemed to resolve itself after a day or so. I reinstalled the game a few times during that time and rebooted the phone a few and just going to bed and leaving it overnight seemed to fix things, lol.