Non-markdown files are not copied across multilingual pages

[ericswpark]

Describe the bug
Given the following layout:

blog/
    post-1/
        index.en.md
        index.ko.md
        image-1.png

Hugo ends up generating the following minified structure:

blog
    post-1/
        index.html
        image-1.png
ko/
    blog/
        post-1/
            index.html

Previously (older Hugo version or anatole release?), the image-1.png file was included in both directories, like the following:

blog
    post-1/
        index.html
        image-1.png
ko/
    blog/
        post-1/
            index.html
            image-1.png

This means that linking is broken on non-base languages. This applies to any non-markdown files, like images and Javascript files.

To Reproduce

1. Set up an example site in the above structure
2. Build with Hugo
3. Observe breakage

Expected behavior

Either Hugo+Anatole should copy over the files, or there should be some sort of mapping so that non-base language translation HTML files map to the files in the base language translation path.

Desktop (please complete the following information):

• Version of the Theme: v1.14.0
• Version of Hugo (run a hugo version if unsure) v0.123.7-312735366b20d64bd61bff8627f593749f86c964+extended windows/amd64 BuildDate=2024-03-01T16:16:06Z VendorInfo=gohugoio

Additional context

This was previously not the case and my website worked fine, but I think a recent update to either Hugo or Anatole changed the behavior. I was wondering if anybody else ran into the same problem and if there's a correct way of linking to the files so that they get mapped correctly or duplicated into different language paths.