A community member was having an issue with an external image asset not loading when building their project for Vercel. The issue was related to the relative URL of the image. The community member found that turning off the 'optimize' feature resolved the problem. In the comments, another community member noted that the images were previously working, and the original problem was just with the logo in the header, before the rest of the page was affected.
I haven't done extensive research but I'm linking to an external image asset and when I built my project for Vercel, the image did not load. The url was relative.
I had a hunch, turned the 'optimize' feature off and this is now working.