Here's an example:

Seems that even if the <img> tag contains a http url, some browsers (chrome,Brave) appear to request using https (presumably if the referring page is https). Even though the image is returned with a 200 (ok) status, if there's a certificate mismatch the image appears as missing (but right-click the 'missing image' and open in new tab and it displays fine). I.E. and Firefox seem to display it fine within the original page. Could also be due to 'tracking image' privacy settings, I guess.
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