Was having all kinds of problems on a test 2.2.0a with the latest GitHub until adding the changes to includes/functions/functions_osh_update.php.

One of them was that Zen Cart was reporting my address to PayPal as the store address, versus the correctly entered address.

Still having a 404 error with no log created when, in the PayPal browser, clicking on return to the store.

ZC 2.2.0a
PHP 8.4
Bootstrap 3.77
Edit Orders 5.0.2
PayPalr 1.2.0 beta
OPC 2.5.4