For the time being I think putting this in /usr/local/bin/start-pulseaudio-x11 is a pretty good workaround:
#!/bin/sh
/usr/bin/start-pulseaudio-x11 "$@"
{ xprop -root -spy > /dev/null 2>&1 || true; pulseaudio --kill; } &
Don't forget to chmod +x /usr/local/bin/start-pulseaudio-x11 !
Best regards
Alexander Kurtz
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