Yes, project with id 7 exists as does user id 3 from created by.
However — I figured out my issue… I turned on UFW. 
Turning it off again unloaded tons of webhooks into n8n without issue. I’ll go figure out my firewall rules now…
I’m not sure about the error, Could not load project for webhook 333: User does not exist [user id: 0]. I do still get the error, but webhooks for task updates are working as expected. FYI, I created a test environment with 0.24.6 and did NOT get the error in that release.
Projects are still not functioning as mentioned in the first post of this topic.