Why does an object collide with itself?

I'm getting an unusual condition where, after using WakeupOnCollisionEnter(Node node) calls back my program with the triggering path, I am getting objects that collide with themselves.
Why is an object colliding with itself?

I don't think that's it.
The docs for WakeupOnCollisionEnter says:
"Class specifying a wakeup when the specified object collides with any other object in the scene graph."
They key words being "any other object", which would seem to preclude the node specified.
The specified object is my player's avatar. I do no checking. I simply let the WakeupOnCollisionEnter class tell me what the avatar collided with, and it tells me

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