Gen in bpatcher and Gen~ conflict?

Hello,

I am experiencing this strange issue. I have a Gen in a bpatcher that prevents a Gen~ to work. The Gen~ is taken from the examples (Squinewave) and the Gen in bpatcher is a simple gcd calculator. I don't see the point in a possible conflict, but I am a newbie in Gen stuff. What's wrong with my code?

I easily solved the problem using a JS instread of Gen, but still I wonder why the conflict

Thank you for your help.

Antonio

(Max 9.1.1 arm64 mac)