Sometime squirrels chew the tree where it starts callousing over, the can make cavities bigger and keep them from closing up. I see this in maples quite a bit, not so sure about sycamores.
What about a rope cable triangle down to the two good branches below the defect?
I think I'd want to cover the defect with wire mesh to keep critters from try to use it as a home and make it worse.
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