Sidebar sort order

[jrfnl]

Describe the BUG

Given a directory layout set up like so:

project root
 |- Sniffs
    |- Classes
    |- Constants
    |- ....
    |- MethodUse
    |- ....

Where each of these folders contains a README.md file with the following contents and one or more additional markdown files:

# DirectoryName

{% include list.liquid all=true %}

I would expect these directories to show alphabetically sorted in the side bar, and they do, except for this one folder MethodUse, which appears at the top of the submenu, completely out of the alphabetic order. (red color added to highlight the problem)

And yes, I have verified that there is no front matter with a sort in the Sniffs/MethodUse/README.md file.

Relevant parts from the _config.yml:

remote_theme: rundocs/jekyll-rtd-theme

readme_index:
  with_frontmatter: true

To Reproduce

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