New libwayland-* let sddm crash with segfault
Jul 22 18:55:49 hhl-2 kernel: sddm-greeter[1727]:
segfault at 8 ip 00007fa692a05bdd sp 00007ffd909a7330 error 4 in libQt5WaylandClient.so.5.15.13[97bdd,7fa6929d2000+a1000]
likely on CPU 1 (core 1, socket 0)
downgrading them fixed it as a workaround
apt install -t testing libwayland-server0/testing libwayland-cursor0/testing libwayland-client0/testing