Can't get custom url schemes to work

[Mrcubix]

I can get anything related to custom url scheme working.

Following the doc does not seem to result in the correct behavior and instead just return the raw text as a link.

I made sure to :

1. Add attrs_block & attrs_inline to enabled extensions.
2. Define schemes as follow in conf.py :

myst_url_schemes = {
    "http": None,
    "https": None,
    "sample": "https://github.com/Mrcubix/OpenTabletDriver-Plugin-Doc/blob/master/samples/{{path}}"
}

3. Attempt using it with any of the following means :

<sample:0.6.x/Samples.Binding/MyBinding.cs>
[here](sample:0.6.x/Samples.Binding/MyBinding.cs){.external}

Except the resulting link is :

• sample:0.6.x/Samples.Binding/MyBinding.cs
  instead of
• https://github.com/Mrcubix/OpenTabletDriver-Plugin-Doc/blob/master/samples/0.6.x/Samples.Binding/MyBinding.cs

Is there something else I'm supposed to configure? Something that isn't on that page or section and SHOULD be?

The repo in question : https://github.com/Mrcubix/OpenTabletDriver-Plugin-Doc