According to Forza Support , you can delete the local wgs folder (Microsoft Store version) and restart your PC to force a fresh cloud sync.
The process is trickier due to encrypted containers. forza horizon 5 save game 1.405.2.0
The version number (or similar build versions) for Forza Horizon 5 According to Forza Support , you can delete
Happy racing in Horizon Mexico, and may your saves never corrupt again. According to Forza Support