Pi Power Button and OctoPrint-PSUControl

[arut16]

Hi all,

I'm using an RPi4 with an Octopi/Octoprint instance on it for 3D printer. In Octoprint software, i'm using
OctoPrint-PSUControl plugin to control a 3v3 relay on GPIO21 and through it power on and down 3D printer with Raspberry. And without the physical power button, this working as it must.

I successfully installed the power-button on GPIO3 and powering on and shutdown of raspberry is working well through the momentary button.

BUT. Then I send a command to close the relay and power on the printer through octoprint. The relay closes and the printer power on and at the same time raspberry seems to "receive" also the command to power off like if I push the new power button but I didn't touch it !

There must be a kind of interference of signal between Pi Power Button and OctoPrint-PSUControl. But I don't know where to start in investigations...

Any help will be very kind !