I didn't see a lot (or any) pictures of what poison ivy looks like once its dominated a habitat for a while, like the woody trunks it develops as it grows uninhibited on trees.
I lived in an area that had under-controlled poison ivy overgrowth, and it was always a challenge to convince people that poison ivy can look differently than what's expected once it's developed unimpeded for years.
I agree, one time I had know idea what this young "tree" was, it looked like an ash sapling, but it was a flowering poison ivy. Couldn't see the classic poison ivy "thumbs" either. Something like this: https://www.maine.gov/dacf/php/gotpests/weeds/images/poison-...
I lived in an area that had under-controlled poison ivy overgrowth, and it was always a challenge to convince people that poison ivy can look differently than what's expected once it's developed unimpeded for years.