The Tumbleweed build of Kleopatra exports key groups as
[General] KeyGroup-Q0UsIueY%00Keys=69C701A436FDD496FAE5580AA151BC5817C228CF, A1745B35025AD43A8505E26B6AEE17E6D065E022 KeyGroup-Q0UsIueY%00Name=certified-group@example.net -----BEGIN PGP PUBLIC KEY BLOCK----- [...]
The correct format is
[KeyGroup-Q0UsIueY] Keys=69C701A436FDD496FAE5580AA151BC5817C228CF, A1745B35025AD43A8505E26B6AEE17E6D065E022 Name=certified-group@example.net -----BEGIN PGP PUBLIC KEY BLOCK----- [...]