Latest search results hint that currently KF master is covered when searching in branch group "kf5-qt5".
IIRC lxr.kde.org uses kdesrc-build to care for the checkouts? In that case chance is the config file used for the kf5-qt5 variant misses the explicit setting
global branch-group kf5-qt5 end global
to make sure that for KDE Frameworks modules also the kf5 branch is used.