I found a article dont know why prestashop did not fix it yet… Or if they will be fixing it in future? No one knows. Jonny maybe making a module that will fix this issue will be a good idea.
@djly5y provide a solution on the comment of the article, you can try it.
Some of my customers require to show the cover image always, that need to modify some files, see the topic: https://www.sunnytoo.com/forums/topic/product-main-image#post-42848
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