4 MHz signal on GPIO0

[hoelzgre]

I am developing a project using the ESP32-audioI2S library and ran in trouble after starting auidio.

After quite some investigation I found that after the call of "audio.setPinout" using the standard I2S pins GPIO0 outputs a 4.096 MHz signal and can no longer be used.
Is this normal behavior of the library and GPIO0 cannot be used together with ESP32-audioI2S ?
Is there a way to switch this off?
Also did quite some reseach on the internet but couldn't find a similar issue