On Windows Okular does not find Kleopatra and therefore the "View in certificate manager" button is greyed out:

This is the same in Gpg4win 5.0.2 and 4.4.1, so nothing recently introduced.

Note for further tests (should then go into a separate ticket if this is still the case for newer versions):

In the Linux AppImage version from VSD 3.3.7 Kleopatra is found but an error occurs:

No fingerprint argument specified for --query