Some of my models do not display a preview image in the search result.

However when I am logged in in the Content Manager and access the preview of the search result, then the preview image does show (see screenshots: Preview). I tried to upload the models again (revision), unpublish and publish the models. Nothing fixes the issue. Only after uploading a new preview file the issue gets solved. I wonder if I am doing something wrong here, or if it just a (known?) glitch of 3DContentCentral.

Any help would be appreciated, since I do not feel happy uploading seperate preview files for every model.

When one need examples, please check the supplier content of 'Van Aarsen'. You will find several examples of models that are missing a preview.