Qt 5.14.0 final is released and up in the [build] repo,thus [kde-next] is closed again.
bvbfan It has reported problems with Qt 5.14 in Wayland session, so it can be expected regressions.
I had noticed odd mouse behavior and higher CPU usage on Wayland, but a patch is added for the qt5-wayland 5.14.0 build, should fix those issues.
KDE Apps 19.12.0 has a nasty bug in Dolphin, see https://bugs.kde.org/show_bug.cgi?id=414227
IMO, blocker to have 19.12.0 move to the stable [apps] repo, needs to be fixed first, Dolphin is barely usable with this.