images returning content-length of 0 intermittently

I'm using a middleware function for some redirects, and occasionally on my pages I will get images coming back "content-length" of 0. Seems to be intermittent, but also everyother refresh they will show up. The function isn't touching any of the images on load, verified with console.log before the middleware function calls next(); Can head to this image, and it seems to do it in a fresh incognito window for me. https://71e0439c.template-2022-biofit.pages.dev/video/lib/img/content/muted.png