IntranetFileLinksEnabled does not work with shared file links

I refer to this setting https://learn.microsoft.com/en-us/DeployEdge/microsoft-edge-policies#intranetfilelinksenabled

Which allows links to local file resources using the file:// protocol

It works as expected if the file is on the local computer, e.g. C:/file/example.txt but if the file is in a shared location, Edge strips the preceeding slashes and cannot find the file, e.g.

<a href="file:////share/file/example.txt">link</a>

If you click on the link above, edge will try to go to share/file/example.txt instead of //share/file/example.txt - we need it to go to the second location as this is a valid file share location