Invalid Data for designs and pictures

Today I was playing the game, everything totally fine and dandy when suddenly I noticed the cars not showing up in my garage. I pinpointed the issue out and I now know that all my designs are invalid data, making the car turn back to white paint when I choose that specific car. Not only this, but the pictures I took with the in game camera is invalid data as well. Does anyone know how to fix this problem?

Ive got the same problem.

At this point all you can do is email Turn 10 forzafb@microsoft.com and PM T10Helios who was helping people with save issues. That’s about all you can do.
Save corruption issues have plagued Forza for a long time through many titles. The save files are bigger than most games and if you interrupt them, they get corrupted. It sucks, but there’s sometimes no fix.
You could try overwriting your local save with one from the cloud, but i’d wait to see if you hear from T10 first.