SDDM crashes with Qt 5.15.7

[AdamWill]

Fedora openQA testing indicates that SDDM crashes with Qt 5.15.7, leaving the system at a black screen. Unfortunately I can't get anything useful out of the coredump, so all the clue I have is this from abrt:

Process 833 (sddm-greeter) crashed in LayerShellQt::QWaylandLayerSurface::QWaylandLayerSurface(LayerShellQt::QWaylandLayerShell*, QtWaylandClient::QWaylandWindow*)()

Here's a tarball of /var/log; note this test ran on Fedora 38 with systemd 252, you cannot read the journal files with journalctl from systemd 251 or earlier due to a format change.

[AdamWill]

Seems this was due to a missing layer-shell-qt rebuild downstream.