Has this happened to anyone?? Wake up with stiff knuckles followed by fingers catching and locking

This started almost six months ago.. I wake up with very stiff knuckles where I can’t bend or make a fist, and then I have to slowly open and close to loosen them up. In the video, I’m turning my hand so you can see all angles. This is NOT like a typical trigger finger. It started with my pinky and ring fingers, then progressed to all fingers on both hands. No crazy swelling that I’ve noticed. Nothing has showed up on x rays or MRI. I’ve seen a hand surgeon and rheumatologist, but they’re not completely sure and I’m being passed around. This has been consistently happening every single morning. Any insight is appreciated!