Restrict RSS Feed to One Category?

If you’re using pretty permalinks, you can add the /feed/ to the end of any given URL on your site and get a feed of what you see.
https://example.com/blog/category/your-cat/feed/

If you’re not using pretty permalinks, it’ll be more like this:
https://example.com/blog/?cat=123&feed=rss2

If you want to change the categories displayed by default, use the category visibility plugin:
https://ryowebsite.com/?p=46

I am using permalinks. But the subscribe link in the sidebar widget for Asides is of the form https://example.com/blog/?cat=123&feed=rss2 while others are like https://example.com/blog/category/your-cat/feed/

The odd thing is that the Aside link times out, but substituting a different category number works fine. The other types of links also work fine.

I don’t understand this and would value an explanation. also, can I modify the form of the link, by tampering with the module? Seems drastic, but I cannot think of another way.