It does not work in a repository that contains dots in the path/name.

[wraith13]

In a repository such as https://github.com/wraith13/wraith13.github.io, it should be recognized as wraith13/wraith13.github.io, in fact it recognizes it as wraith13/wraith13 and access failed To do.

[wraith13]

Probably the cause of the problem is here.
https://github.com/Microsoft/vscode-github-issues-prs/blob/master/src/github-issues-prs.ts#L213