Custom subdirectory for blog posts

Hi! First of all, thank you so much for making Ghost the great platform that it is.
I’m in the process of setting up a new blog, and I’m trying to make all posts appear under the “/post/” subdirectory. I also want to keep all my pages on the main “/” directory, however. What I came up so far by editing the routes.yml file is this:

routes:
  /:
    controller: channel
    template: index

collections:
  /post/:
    permalink: /post/{slug}/
    template: index

taxonomies:
  tag: /tag/{slug}/
  author: /author/{slug}/

And it works pretty fine. All posts show under their respective slug: https://example.org/post/post-1, etc.
There is one issue, however. If I go to https://example.org/post/, without specifying the post, I see my homepage. All the other pages are under the main directory (eg https://example.org/about/), however, the homepage shows in both places: https://example.org/ and https://example.org/post/. This is also shown by the fact that the sitemap.xml shows it as a separate page, indeed:

URL (6 total)	Images	Last Modified
https://example.org/post/	0	2020-11-09 10:46
https://example.org/	0	2020-11-09 10:46
https://example.org/contact/	0	2020-11-09 09:13
https://example.org/about/	1	2020-11-06 13:22

As if I manually created a “post” page from the Ghost admin interface. If I restore the default routes.yml, the page obviously disappears.
The only way I thought this could be avoided is by using the redirects.json file. However, If I add a redirect that points “/post/” to “/”, it correctly redirects me there, but the sitemap.xml now has an even bigger issue: the /post/ page is listed twice:

URL (6 total)	Images	Last Modified
https://example.org/post/	0	2020-11-09 10:46
https://example.org/post/	0	2020-11-09 10:46
https://example.org/	0	2020-11-09 10:46
https://example.org/contact/	0	2020-11-09 09:13
https://example.org/about/	1	2020-11-06 13:22

This makes the /post/ page appear higher in search results, and sometimes gets mistakenly confused as the true homepage. Does anyone have any idea on how to fix this? Thanks!