Found in

• 104.0RC3

Affected versions

• 105.0a1 (20220816190318)
• 104.0 (20220818191623)
• 102.2.0esr

Affected platforms

• Windows10x64
• macOS 11
• Ubuntu 21.04

Steps to reproduce

1. Open https://www.tiktok.com and open PiP for a random video.
2. Mute the video from the PiP controls.

Expected result

• The video is muted and the icon is changed to Mute inside the original player.

Actual result

• The video is muted but the icon does not change inside the original player.

Regression range

• I will search for one asap if there is one.

Additional notes

• Attached a screen recording.
• The sound of the video mutes/ unmutes as expected.
• The same behavior can be seen on https://www.linkedin.com/.

It seems that this issue is not a regression. With these STR, I could reproduce the issue with Nightly 71.0a1(build ID: 20191011215012), before the sound button was implemented on the PiP window. I think it's safe to assume that this issue is not a regression.