The Qt5 building has an error on producing the <code>qt-webkit-kiosk</code> artifacts. Following [https://patchwork.ozlabs.org/project/buildroot/patch/20220929181350.1026033-1-thomas.ballasi@savoirfairelinux.com/ this thread] you can find a patch for fixing the issue:
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QT5WEBKIT_CONF_OPTS += \
+ -DCMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT=ON \