https://bugzilla.redhat.com/show_bug.cgi?id=2051062
--- Comment #4 from Aleksei Bavshin alebastr89@gmail.com --- Spec URL: https://alebastr.fedorapeople.org/review/river/river.spec SRPM URL: https://alebastr.fedorapeople.org/review/river/river-0.1.3-1.fc38.src.rpm
I assumed that we don't do that for desktop session files
And that is why:
error: file contains key "DesktopNames" in group "Desktop Entry", but keys extending the format should start with "X-"
The session file is not a desktop entry, even if it's named like one and may look exactly like one :(