Mesh is not Showing in Studio

Hello,

i have a problem. My Mehses are not Showing in a game im working on.

I tried to Copy the Object in Question into another Blank Studio File and Suddenly it Shows up.

The Mesh is clickable, not transparent and worked for Months before it just suddenly happned. Can Anyone help me out here?

Thanks!

THE OBJECT IN THE GAME

THE OBJECT IN A NEW GAME FILE