Hello,
Now that it can be assumed that this problem only arose after Windows 11 was updated to 24h2 and that this happened with several different microphone manufacturers, the problem of the automatic activation of the microphone also occurs when you go into the standard Windows sound settings, which means that you can rule out that it is solely due to the manufacturer's drivers.
By the way, I have also had this problem for a few days, exactly since the point at which I installed the 24H2 update. My mic is a HYPERX Quadcast S.
In terms of data protection, it is not acceptable if Windows activates microphones at will even though I have muted them.