Internal microphone and external jack 3.5mm not work since 3.6.8 beta

[Labestiajake]

Your system information

• Steam client version: 1722028579
• SteamOS version: 3.6.8 20240626.100
• Opted into Steam client beta?: [Yes/No] Yes
• Opted into SteamOS beta?: [Yes/No] Yes
• Have you checked for updates in Settings > System?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

When I updated to the latest version of Steam Os Beta, the internal and external microphone stopped working. Then I went to the stable version and the microphone works, but when I go back to the beta version it no longer works.

Steps for reproducing this issue:

1. I enter desktop mode
2. I look at the bar inside the KDE audio menu and it doesn't move when I speak and Steam Chat not detect my voice.
3. I insert the external microphone and it doesn't work either
4. I change to the stable version and check the same and if it works without problems.
5. I went to the beta version and again the internal and external microphone stopped working.