Update after 2+ Addition hours of play.
since My last post when i reset my progress, followed by starting a new save file. I can confirm that sponsors are working properly. Green check marks with the correct number/number. So far I have completed 4 sponsors and everything is still without issues and unlocking perfectly.
yellow markers are still not reappearing in my game in none of the menus (story, career, garage, team).
only time I saw a yellow marker reappear was when it was tied into a event that I haven’t unlocked yet. Once I unlocked event and checked it out, yellow marker never came back.
still sticking with previous guess that anyone who is having issues may be because there save file predates the patches that claims to fix the issue in effect somehow not letting the patch work as intended.
Im not a developer but that’s just my guess. Either that or something may be wrong with the “mechanic development” maybe when buying a specific perk it may be messing with the numbers? Hence cause if the bug… idk? I only say that since I have not purchased any of them since starting over.
all I know is I can verify in my case that resetting progress followed by starting new save file has fixed all issues for me.
will keep updating if anything changes or bugs resurface.
i will try and take pictures on next update.