Problem with one face material and display mode

I have an issues regarding my display mode. One face of a blocs show a rendered material regardless of the display mode I choose. When I join this face with others they show all in rendered mode ?
Break the bloc doesn’t change anything.

Do you know where it come from ?

Hi Edwin -
Please post a simple 3dm file with the object that you are having issues with.

Ok thank you
faces issues.3dm (13.5 MB)

When I export my object and open the files it show directly the Texture mapping windows…