i have the latest zen cart and no other modules.

i copied the .htaccess from the output of the installation check, and got

"The requested URL /furniture/folding-butterfly-sakura-bamboo-handheld-vintage-fan-for-beach-s was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request."

same results if i added the slash, i.e. RewriteRule .* /index.php [QSA,L]

the URL comes from clicking the item on my home page https://www.bamboyant.life/

i got most of the files from torvista/CEON-URI-Mapping https://github.com/torvista/CEON-URI-Mapping (for php 7), except for the few files from the latest ceon uri mapping.