There appears to be some bug in Edge and Windows SmartScreen where it mishandles the subject name in our signing certificate. Specifically, they replace all non-ASCII characters with U+FFFD (�).
The subject name looks fine if we inspect it via the properties dialog on the executable, so there doesn't appear to be anything actually wrong with the certificate.
Created attachment 1155 [details]
Created attachment 1156 [details]
If we check our certificate using dumpasn1, we can see that the strings are tagged with UTF8String. So even more evidence that this is a Microsoft bug.