Pagination adds trailing slash when it shouldn't

[DhrRob]

When the WordPress site has been set-up to not use trailing slashes, the 1st page of the pagination still adds a trailing slash to the URL.
Tested with WordPress 5.6 and 5.5 in Nginx 1.16.0 with Twentytwenty, no active plugins.

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For example:
The archive page is ​https://playground.local/category/classic, when using the pagination to go to page 2, the url changes to ​https://playground.local/category/classic/page/2. Now, when I try to navigate back to page 1 of the archive, the URL is ​https://playground.local/category/classic/. Adding a trailing slash, even though the WordPress installation has been set up so that it doesn't use trailing slashes.