[Python] Supercollider: OSCFunc not catching /osc/amplitude despite server erroring on it?

I'm trying to control SuperCollider sound with p5.js, using a Python script as a WebSocket-to-OSC bridge. My Python bridge sends /osc/amplitude OSC messages to SuperCollider. scsynth reports "FAILURE IN SERVER: /osc/amplitude Command not found," so the messages are reaching the server. However, my sclang OSCFunc (registered for '/osc/amplitude' on s.addr) isn't triggering, and OSCFunc.trace(true); doesn't show these specific messages arriving in sclang (only /status.reply). Any ideas why my OSCFunc isn't intercepting these

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