There are seemingly 2 issues.
1. Add-ons that require downloading through browser are not shown unless "Show incompatible packs" are selected. This is a regression since v1, where one didn't have to select this option to see them.
2. Some add-ons are not shown at all, e.g:
- Publication Typefaces Collection
- Wallington Pro – Typeface
It seems it's the case also for v1.
I uploaded screenshots from Photo v1 and v2 showing 1st issue. It's impossible to show 2nd one.
Issue applies to all Affinity apps, not only Photo.