I saw it on my snow pea plant today. I’ve not noticed any caterpillars on my pea plants before, and I’m out there daily looking for peas to pick.
Edited: I’ve taken a few more photos today in the bright light as it was getting dark last night. It’s eaten a fair bit and stayed on through a rainstorm. It has two black bumps on its back.
Just a stick, nothing to see here... Found dangling from silk, put on nearest leaf for photo-taking purposes, so probably not host plant.