The first page's URL contains `index.html` despite the permalink opting out of it

[CookiePLMonster]

With the global configuration like this:

pagination:
  enabled: true
  per_page: 5
  title: ":title"
  sort_reverse: true

and the page configured to paginate a collection through its front matter:

permalink: /updates/
pagination:
  enabled: true
  per_page: 10
  collection: updates

I then build the navigation bar by iterating through site.pages, and I found that the page.url of the Updates website became /updates/index.html, even though the permalink should indicate otherwise:

Curiously, on pagination itself, paginator.first_page_path respects the permalink and the URL is /updates/, so this issue is isolated to site.pages.