Media files appear blank with default.png

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I am having a problem with a website where files in media library appear blank. This happened after I tried to add a featured image to a post then all the features images attached to the posts dissapeared and do not show and media files appeared like in the image. I have tried deactivating plugins, theme, updating wordpress to different version but nothing seems to work. Do you guys have any idea what it might be causing this ?

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