Reference Link attributes is broken

[ManUtopiK]

It's a bit far-fetched, but with a reference link, we can't add attributes :

[link][ref]{.class}

[ref]: http://example.com

Attributes class disappear.

I also tested this but it's not recognized as a linkReference :

[link]{.class}[ref]

[ref]: http://example.com

Reproduction

Link:

• https://github.com/ManUtopiK/remark-mdc/tree/referenceLinkAttributes

Checklist

• I have tested with the latest Nuxt version and the issue still occurs
• I have tested with the latest module version and the issue still occurs
• I have searched the issue tracker and this issue hasn't been reported yet