Hello,
We are trying to reproduce the error on the staging site but never get that. Any chance that we could get a video from you where you face the error? Or at least what product do you add to the cart that gives the error?
Function that we use and that gives the error in your log is the default WooCommerce function https://woocommerce.wp-a2z.org/oik_api/wc_productis_visible/
We found a similar report about such an issue here https://wordpress.org/support/topic/ajax-call-error500/ and as we can see it was caused by the cache.
Regards