bash-5.2$ WAYLAND_DEBUG=1 org.libreoffice.LibreOffice 2>&1 > /dev/null | grep "app_id"
[2209181.505]  -> xdg_toplevel@38.set_app_id("soffice")
[2209468.703]  -> xdg_toplevel@47.set_app_id("soffice")
[2209519.815]  -> xdg_toplevel@47.set_app_id("libreoffice-startcenter")