GIF featured image is resized on server but not used in frontend. Why?

I use a very basic setup of twentyseventeen and die most recent wp version. When I upload PNGs or JPGs they as a featured image, they are saved as a resized version on my uploads folder and used on the homepage and archive pages as a resized version the responsive images.

GIF files are also saved in the uploads folder but are not used as responsive image. Only the original size is referenced and loaded in HTML.

Is there any reason for this behaviour? Why arn’t the image sizes used if they exists as resized gif files generated by wordpress? I have no plugins installed. The gifs are not animated gifs.

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