https://i.imgur.com/q41Exfu.png

When I play video on youtube Firefox is not visible in sound applet → applications. But I can hear sound.

When I play Spotify and start playing in Firefox, I have no sound in Firefox.

I used to was able to play sound from multiple applications at once, simultaneously and Firefox was visible in applet when it played sound.

It started after recent update to 5.21. Maybe there was Firefox update as well, I don't know what is the real cause.

Operating System: Manjaro Linux
KDE Plasma Version: 5.21.2
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Kernel Version: 5.11.2-1-MANJARO