Posting here because I am unable to replicate this issue using just using yaml in a page with pure Jekyll.
The following works:
api:
slug: api
info: 'Try out <a href="https://example.org">the docs</a>'
While this gives error:
api:
info: 'Try out <a href="https://example.org">the docs</a>'
slug: api
The error is Invalid scheme format: *text* <a href="https (Addressable::URI::InvalidURIError).
Is there perhaps something with how this plugin parses the yaml that could result in this?