Can someone tell me why when i save a project it shows a lightburn icon and not a preview of the project

I get LB icon not preview when saving projst

Go to Windows folder options and uncheck Always show icons, never thumbnails.

Hi my show icons was already unchecked but still shows Lightburn icon instead of thumbnails for files. It only appears to be happening with 2.2 by the looks of my few computers.
Also only happens with LB files, my pictures folder shows all thumbnails for photos etc except the LB generated files