Hello,
As a user of AbanteCart 1.2.11, I am currently testing Abantecart 1.3.4 on localhost with PHP 8.2.12.
The storefront had a totally blank page, apart from the welcome message.
(No change if adding a category, a product, and clearing the cache.)
I the template in use was "bootstrap5" instead of "default" one.
I switched the template from "bootstrap5" to the default one, and the storefront displays OK.
Likely are some additional requirements for the bootstrap5 template to display, but this is very confusing for beginners.
I would suggest keeping only the default template in the initial installation, and let people download alternative templates if they want.
Cheers.