wrong .editorconfig used for (some/all?) csharp settings

[peeveen]

Platform: Windows

Folder structure:

home
|--.editorconfig
|-- repos
    |-- test
        |-- .editorconfig
        |-- blah.cs

Home folder .editorconfig looks like this:

# EditorConfig is awesome: https://EditorConfig.org

# top-most EditorConfig file
root = true

[*]
indent_style = tab
indent_size = 2
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = false

[*.cs]
csharp_new_line_before_open_brace = none

Repo-specific .editorconfig file is identical apart from using the value all for the C# setting.

I created a dummy class in blah.cs.
It is auto-formatted like this:

class blah {

}

I would expect the opening brace to be on a new line due to csharp_new_line_before_open_brace = all in the repo-specific .editorconfig file.

If I change the HOME folder version to have a value of all, the class is then formatted as expected.
But nothing I do in the repo-specific version will make a difference to the C# formatting.
Things like indentation (tabs/spaces) work okay: the repo-specific version overrides the home folder version.
Am I missing something obvious?