I got this bug too. But only in my notebook. I have another computer and kwin-x11 does not freeze. Maybe because my computer uses a nvidia GPU and my notebook uses an onboard Intel Graphics.
One workaround is open konsole (Ctrl-Alt-T) and restart plasma with this command:
killall -9 plasmashell && kstart5 plasmashell
When kwin crashes I got these syslog messages:
Aug 31 07:24:57 r2d2 dbus-daemon[776]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Aug 31 07:26:15 r2d2 kwin_x11[93502]: OpenGL vendor string: Intel
Aug 31 07:26:15 r2d2 kwin_x11[93502]: OpenGL renderer string: Mesa Intel(R) HD Graphics 620 (KBL GT2)
Aug 31 07:26:15 r2d2 kwin_x11[93502]: OpenGL version string: 4.6 (Compatibility Profile) Mesa 22.2.0-rc3
Aug 31 07:26:15 r2d2 kwin_x11[93502]: OpenGL shading language version string: 4.60
Aug 31 07:26:15 r2d2 kwin_x11[93502]: Driver: Intel
Aug 31 07:26:15 r2d2 kwin_x11[93502]: GPU class: Kaby Lake
Aug 31 07:26:15 r2d2 kwin_x11[93502]: OpenGL version: 4.6
Aug 31 07:26:15 r2d2 kwin_x11[93502]: GLSL version: 4.60
Aug 31 07:26:15 r2d2 kwin_x11[93502]: Mesa version: 22.2
Aug 31 07:26:15 r2d2 kwin_x11[93502]: X server version: 1.21.1
Aug 31 07:26:15 r2d2 kwin_x11[93502]: Linux kernel version: 5.19.5
Aug 31 07:26:15 r2d2 kwin_x11[93502]: Requires strict binding: yes
Aug 31 07:26:15 r2d2 kwin_x11[93502]: GLSL shaders: yes
Aug 31 07:26:15 r2d2 kwin_x11[93502]: Texture NPOT support: yes
Aug 31 07:26:15 r2d2 kwin_x11[93502]: Virtual Machine: no
Aug 31 07:26:16 r2d2 kwin_x11[93502]: XIO: fatal IO error 0 (Sucesso) on X server ":0"
Aug 31 07:26:16 r2d2 kwin_x11[93502]: after 3526176 requests (3526176 known processed) with 0 events remaining.
Aug 31 07:26:16 r2d2 kwin_x11[93502]: Application::crashHandler() called with signal 11; recent crashes: 1
Aug 31 07:26:16 r2d2 systemd[4872]: plasma-kwin_x11.service: Main process exited, code=exited, status=1/FAILURE
Aug 31 07:26:16 r2d2 systemd[4872]: plasma-kwin_x11.service: Failed with result 'exit-code'.
Aug 31 07:26:17 r2d2 systemd[4872]: plasma-kwin_x11.service: Scheduled restart job, restart counter is at 5.
Aug 31 07:26:17 r2d2 systemd[4872]: Stopped KDE Window Manager.
Aug 31 07:26:17 r2d2 systemd[4872]: Starting KDE Window Manager...
Aug 31 07:26:18 r2d2 systemd[4872]: Started KDE Window Manager.
Aug 31 07:26:19 r2d2 dbus-daemon[4892]: [session uid=1000 pid=4892] Activating service name='org.kde.KSplash' requested by ':1.699' (uid=1000 pid=154595 comm="/usr/bin/kwin_x11 --replace")
Aug 31 07:26:20 r2d2 kwin_x11[154595]: OpenGL vendor string: Intel
Aug 31 07:26:20 r2d2 kwin_x11[154595]: OpenGL renderer string: Mesa Intel(R) HD Graphics 620 (KBL GT2)
Aug 31 07:26:20 r2d2 kwin_x11[154595]: OpenGL version string: 4.6 (Compatibility Profile) Mesa 22.2.0-rc3
Aug 31 07:26:20 r2d2 kwin_x11[154595]: OpenGL shading language version string: 4.60
Aug 31 07:26:20 r2d2 kwin_x11[154595]: Driver: Intel
Aug 31 07:26:20 r2d2 kwin_x11[154595]: GPU class: Kaby Lake
Aug 31 07:26:20 r2d2 kwin_x11[154595]: OpenGL version: 4.6
Aug 31 07:26:20 r2d2 kwin_x11[154595]: GLSL version: 4.60
Aug 31 07:26:20 r2d2 kwin_x11[154595]: Mesa version: 22.2
Aug 31 07:26:20 r2d2 kwin_x11[154595]: X server version: 1.21.1
Aug 31 07:26:20 r2d2 kwin_x11[154595]: Linux kernel version: 5.19.5
Aug 31 07:26:20 r2d2 kwin_x11[154595]: Requires strict binding: yes
Aug 31 07:26:20 r2d2 kwin_x11[154595]: GLSL shaders: yes
Aug 31 07:26:20 r2d2 kwin_x11[154595]: Texture NPOT support: yes
Aug 31 07:26:20 r2d2 kwin_x11[154595]: Virtual Machine: no
Aug 31 07:26:36 r2d2 kwin_x11[154595]: Freeze in OpenGL initialization detected
Aug 31 07:26:36 r2d2 kwin_x11[154595]: Application::crashHandler() called with signal 6; recent crashes: 1
Aug 31 07:26:37 r2d2 kwin_x11[154595]: KCrash: crashing... crashRecursionCounter = 2
Aug 31 07:26:37 r2d2 kwin_x11[154595]: KCrash: Application Name = kwin_x11 path = /usr/bin pid = 154595
Aug 31 07:26:37 r2d2 kwin_x11[154595]: KCrash: Arguments: /usr/bin/kwin_x11 --replace
Aug 31 07:26:37 r2d2 systemd[4872]: plasma-kwin_x11.service: Main process exited, code=killed, status=6/ABRT
Aug 31 07:26:37 r2d2 systemd[4872]: plasma-kwin_x11.service: Failed with result 'signal'.
Aug 31 07:26:37 r2d2 systemd[4872]: plasma-kwin_x11.service: Scheduled restart job, restart counter is at 6.
Aug 31 07:26:37 r2d2 systemd[4872]: Stopped KDE Window Manager.
Aug 31 07:26:37 r2d2 systemd[4872]: Starting KDE Window Manager...
Aug 31 07:26:37 r2d2 systemd[4872]: Started KDE Window Manager.
Maybe it is related with opengl but, even disable composing, I got kwin random freezing hours later.