Motion zone suddenly stopped working after 3 years

I set up a motion zone for my Ring Pro 2 hardwired doolbell 3 years ago and it's been working flawlessly ever since. Here's a screenshot from the app: https://i.imgur.com/NUZsdKP.jpeg Since the last week or so the doorbell is not detecting motion at all. If I make the motion zone larger it works as normal. I don't want to do this though as I get a lot of people walking past my house and it notifies me every couple of minutes. I can stand right in front of it waving my arms, or even covering the camera with my hand and it doesn't detect motion. Has something changed with the motion zones?