Prestashop redirects friendly URLs

[Walrus]

Using Prestashop 1.7x, when I try to create a sitemap with a commercial application (A1 Sitemap Generator), it refuses to list products that have combinations because Prestashop redirects by adding a number to the URL, so requires a hack which may affect ranking. For example:

Friendly URL:

http://www.shangara.me/home/6-the-national-theatre-of-great-britain-4-of-4.html

Redirected URL:

http://www.shangara.me/home/6-49-the-national-theatre-of-great-britain-4-of-4.html

When I try and create a sitemap with the Google Sitemap module from Github, it just throws a 505 error.

So how are people creating acceptable sitemaps when site includes products with combinations?

Thanks.