Why do I always have to go through hard restart after printer.cfg modification?

Hello,

I am using Klipper with Mainsail on a RatRig V-Core Pro printer. After modification of the printer.cfg file the restart doesn’t occur, even if I push on either the “Restart” or “Restart Firmware” button.

This error message remains:
“Printer is not ready
The klippy host software is attempting to connect. Please
retry in a few moments.”

I must switch the printer off then on again.

What’s wrong?