Help with collections error: "The following destination is shared by multiple files"

[karloskalcium]

Hi we ran into an error the looks like the following:

| > bundle exec jekyll doctor
Configuration file: /Users/x/dev/jekyll-learn/_config.yml
          Conflict: The following destination is shared by multiple files.
                    The written file may end up with unexpected contents.
                    /Users/x/dev/jekyll-learn/_site/test.md
                     - /Users/x/dev/jekyll-learn/src/_test/sections/test1.md
                     - /Users/x/dev/jekyll-learn/src/_test/sections/test2.md

Can anyone explain what is going on here? I put up a sample repo demonstrating the issue (Jekyll 4.2.2, ruby 3.2.4).

Additionally, when run it generates a test.md in the root directory, and oddly the links in test/index.html that are supposed to go to sections/test1.md and sections/test2.md go to ./test.md instead upon build.

Am I doing something wrong? It seems to have something to do with the permalink generation and the sections subdirectory, but I'm confused why permalink is generating a file with the same name as the directory. If I remove the permalink instruction the problem goes away, but am confused as to what is happening and why.

collections:
  test:
    output: true
    permalink: /:collection/:title

[karloskalcium]

possibly relevant: #6063