Whenever I paste a screenshot into a Pull Request, I see a loading" placeholder image that never goes away. It remains there after I save the PR and if I go to another PR and come back. It looks like the image below, with the little file icon in the center flashing like it's loading, but it never goes away. On some PR's I can see the actual images, and for old PR's I can see the actual images, but for most new images I paste into PR's, it looks like this.

At first I thought everyone was not able to see my images, but then I realized it was just me. I typically use Chrome, so I tried in Firefox, and I could see the images fine. So I followed the steps in this link... Tried in incognito mode, disabled all extensions, cleared the browser cache, cookies, service workers, etc. Did these one at a time, closing and re-opening Chrome completely after each. It still didn't work. On a whim, I hit Ctrl+F5. All of a sudden I could see the images. Somehow Chrome seems to have had the "missing image/loading image" image cached and was tying it to new images I was pasting in, even after I completely cleared Chrome's cache, etc. But Ctrl+F5 somehow fixed it.
Posting this question here in case someone has a similar problem in the future. If anyone has any info on why Chrome behaved this way, that would be interesting to know as well.