You need to add an image to the product gallery. Have you done that? If so, and it does not work, deactivate all the plugins not related to the theme and switch the parent theme, check the issue, if the problem remains, leave the plugins not activated and provide the site admin access to the private area
You have one and the same image main product page and in the gallery, https://prnt.sc/r30s8i Try to put a black shoe in the gallery to the first place and check.