Interesting note: after I did this, I booted in Safe Mode, and my screen came on for half a second; just long enough to recognize the wallpaper does indeed match what the screen sharing menu indicates should be appearing.
I tried connecting my dad's laptop to see if it was also affected, since he never uses betas, and tends to ignore regular software updates for weeks, but he is sadly on 15.3.2, and same issue as me. (I only get the screen to flash for a fraction of a second when it first connects in Safe Mode.)
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