It was important for me to fix this because the :VimwikiRenameFile command is unable to find links inside .md files that are using vimwiki-style links.

For example if I have a page named SomeSubject.md and in some other .md page i have a link to it like this: [[SomeSubject.md]], :VimwikiRenameFile inside SomeSubject.md would fail to find the [[SomeSubject.md]] link to it and rename it. It would correctly rename the link if it is in markdown format: [Some Subject](SomeSubject.md)