I solved it! In Pulse audio volume control app I changed the output of LW to Built-in Audio Analog Streo.

Are your tabs starting muted?

No.

Try to uncheck the autoplay option in site permissions to check if this causes it.

I did it, but the problem still exists.

I couldn’t find such thing in permissions’ part.

I set them to true in about:config, but the problem still exists.

These are qv2ray’s filesystem permission section in flatseal:

In my opinion there shouldn’t be any permission problem. I run the app with user and as the permissions I mentioned, user has access to execute it.

Yes, it is a binary file.

I found it. I should set pyright.disableDiagnostics to true in CocConfig.

Thank you for your complete explanation! Now I have a question. I know that this note that coc-pyright shows does not hurt code’s running. But the note hurts me when I am coding. Do you know how to remove pyright’s type hint?