I can confirm that this behaviour is still present on kde 5.20.4.
You can run e.g. khelpcenter and observe:
kf.service.services: The desktop entry file "/usr/share/applications/qemu.desktop" has Type= "Application" but no Exec line
kf.service.sycoca: Invalid Service : "/usr/share/applications/qemu.desktop"
I can confirm that this behaviour is still present on kde 5.20.4.
You can run e.g. khelpcenter and observe:
kf.service. services: The desktop entry file "/usr/share/ applications/ qemu.desktop" has Type= "Application" but no Exec line applications/ qemu.desktop"
kf.service.sycoca: Invalid Service : "/usr/share/