After upgrading to 8.x-1.0-beta3, the media_thumbnails_svg and media_thumbnails_tiff modules don't work any more.
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Ability to edit thumbnail manually or programmatically
RTBC
, this module was changed to only generate a thumbnail if a media item still has the default thumbnail. Unfortunately this check does not work for Image media items, so createThumbnail() is never called.
Install media_thumbnails_svg or media_thumbnails_tiff. Create an image media item, uploading a .svg or .tiff file. No thumbnail is visible in the Media Library.
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