Similar.
Didn't realize the tree had grown around the 6' tall sign pole about 40 years ago. It was embedded into the middle of the tree trunk. Multiple cuts to drop the trunk. Eventually, after ruining 5-6 chains, we lifted the thing with an excavator, remaining part of the pole still sticking out of the bottom of the 6' tall trunk.
I've had that happen, too. I've had good luck getting the wood carved out of the way, and then polishing the steel off with a cutting torch or an abrasive saw. One time only: The contractor that hired me had a huge excavator on site. They gave me a key and let me push the large oak tree over, snapping the hidden metal fence post.
Worst case was a 3' diameter oak tree that had a hidden column of concrete in it. We managed to break it off by attaching a chain to the 25' tall spar and yanking on it with a truck.
Has anyone ever used a carbide chain to gnaw through a metal post? That's what the firemen use on roof penetration.