That sounds incredibly frustrating! Losing progress like that, especially after getting so far, is a real pain. I can only imagine how disheartening it is to lose prestige level 12. I haven't personally experienced that bug, but I’ve had similar things happen in other games, especially when internet connectivity gets wonky. Have you tried checking the game forums or support pages? Sometimes other players have found workarounds, or maybe the developers have acknowledged the issue. It's almost as upsetting as losing a really good run in Snow Rider 3D right at the end! Good luck getting it sorted!
https://snowrider3dfree.com