Which version of QtWebkit do you use Webcat with? It works for me with QtWebkit 5.212 edit: Can confirm it looks a bit broken with QtWebkit 5.6.2
Fatal error: File './qt/armv7hl/libqtwebkit5-5.6.2+git5-1.3.1.armv7hl.rpm' not found on medium 'https://releases.jolla.com/releases/2.2.0.29/jolla/armv7hl/'
pkcon refresh