ESP-12E board.
Debian 12.
Baud rate 115200.
Arduino Comunity Edition (vscode extension).

The code uses the ESP8266WIFI.h library to use the board as an AP.
Everything works fine, but as soon as I enable monitor mode (pointing to the correct usb), the Hotspot disables, and nothing is printed in the log. But when I turn off serial monitor, I can see the ESP wifi again.
Running the exact same code in Arduino IDE shows the messages in the monitor with no problem. Same baud rate and same usb device.