In my last comment I was just meaning I don’t like how after adjusting an anim with FK rig 126 curves get added. Before fixing it with the FK rig all those curves were not there.
As for the overall topic, I didn’t see such a curve. Plus when I go to view any Control Rig made anim I tested the actual IK bones never moved from the default A pose.
The base issue was not that IK wasn’t working, it was that the Control Rig seems to not move IK bones.