Startupscreen not running in Weston compositor

Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
QSocketNotifier: Invalid socket specified
"DBUS_SESSION_BUS_ADDRESS" "unix:path=/run/user/0/dbus_session_socket"
"FB_MULTI_BUFFER" "2"
"QTWEBENGINE_DISABLE_SANDBOX" "1"
"QT_IM_MODULE" "qtvirtualkeyboard"
"QT_QPA_EGLFS_FORCEVSYNC" "1"
"QT_QPA_EGLFS_KMS_ATOMIC" "1"
"QT_QPA_EGLFS_KMS_CONFIG" "/etc/kms.conf"
"QT_QPA_GENERIC_PLUGINS" "squish:10100"
"QT_QPA_PLATFORM" "eglfs"
"SQUISH_PREFIX" "/opt/squish"
"XDG_RUNTIME_DIR" "/run/user/0"
"startupscreen" QList("-platform", "wayland-egl")
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
wl_drm@4: error 0: authenticate failed
qt.qpa.wayland: Failed to initialize EGL display 3001
qt.qpa.wayland: "wl-shell" is a deprecated shell extension, prefer using "xdg-shell" if supported by the compositor by setting the environment variable QT_WAYLAND_SHELL_INTEGRATION
qt.qpa.wayland: Loading shell integration failed.
qt.qpa.wayland: Attempted to load the following shells QList("xdg-shell", "wl-shell", "ivi-shell", "qt-shell")
qt.qpa.plugin: Could not load the Qt platform plugin "wayland-egl" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.Available platform plugins are: minimalegl, vnc, wayland-egl, eglfs, minimal, vkkhrdisplay, offscreen, wayland.
quit