Hello,
It is not a bug, but the reason why we did not create 1 article with strong recommendation, as was mentioned “settings may be different from site to site depending on many factors”. All options of the theme can’t be activated with all options of cache plugin, because some compatibility issues will occur (however I will send your report to dev team, and they will check if there is anything that can be done from our side to make the mentioned settings compatible). On niche-market02 demo, a different hover effect is activated for product images, so mentioned settings work fine there. On your site, you need to do a few tests to find which settings of WP Rocket plugin should be activated to achieve the best result.
Setting up the cache plugin should be done in one of the final steps of speed optimization, before activation WP Rocket, you need to do basic optimization, which we mentioned in the private content area for you, optimize images, activate XSTORE Ajaxify in the settings of some large elements, disable large and unuseful plugins (it may help to reduce the amount of js files), and so on.
Regards