Talk over problem

I used the version 2.4.6 and I had a issue since a couple of weeks with the talk over button.
When I click on it nothing happen, The playback level is not reduce as normally do.
I update my version to 2.4.7 and same problem appear again !
I don’t understand because it worked perfectly before

How I can resolve my issue ?

Thank you

Maybe you have to adjust the Talk over value in the settings?