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I think I found the reason for this.
On my system I have two protocol files for application/zip:
/usr/share/kservices5/krarc.protocol
protocol=krarc archiveMimetype=[...],application/zip,[...]
/usr/share/kservices5/zip.protocol]
protocol=zip archiveMimetype=application/zip
KProtocolManager::protocolForArchiveMimetype() randomly returns one of the above protocols but the Gwenview test expects zip.