Great it worked for you as well! It was actually another Samsung user that avdvised me on this on the Polish Samsung community forum, so all kudos to him!
As far as I can tell so far it works for my S21. How on earth did anyone find this solution? And what difference will disabling all the apps make? Kudos to the originator!!
One caveat. I use Night Clock which needs to be on top even of the lock screen. That needs to be left on or it doesn't work. That apart the solution works fine for me.