Screen lock doesn't work after upgrade to 21.10

I upgraded 21.04 to 21.10 and screen lock doesn’t work since then. Not using key combination (tried to change - no result); not via graphical menu; not after suspend. It just doesn’t work.
How can I fix this? This is a high security risk to me.
Thank you for your help!

$ ps aux | grep -i screensaver | grep -v grep
dbz        16926  0.0  0.0 238988  5200 ?        Sl   17:46   0:00 /usr/libexec/gsd-screensaver-proxy
dbz        17054  0.0  0.3 2661772 26904 ?       Sl   17:46   0:00 /usr/bin/gjs /usr/share/gnome-shell/org.gnome.ScreenSaver

You have both GNOME Shell and Budgie installed - I’m guessing you are running GDM3?

From the above some ideas. But in essence - GNOME made changes in 21.10 that breaks budgie. Upstream Solus also have noted this and their recommendation is either / or - not both should be installed. Don’t use GDM3 either if you use budgie.

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GDM3 has been disabled in systemd but I’ve uninstalled it anyway.
Found temporary solution in post you proposed. Thank you so much!