Hi Panagiotis,
Thanks for reaching out to us.
When you upload an image using the media uploader, WordPress automatically creates several copies of that image in different sizes.
At the time of creating new image sizes for animated GIFs, WordPress ends up saving only the first frame of the GIF.
For more, you can read this article.
I hope I could clear your confusion.
Thank You
GIF Images not Playing in Variations
Panagiotis Lambrianides
The reason am messaging you today is because my client tried to add GIF image in the variations pro and when he is adding a GIF image instead of static image, the GIF is not playing is static, here’s a reference of a product we used the GIF for variation image but is not playing. https://muaprostore.com/shop/knknknkn