Browser issue XenForo upgrade process image is broken

I just upgraded my another test forum, and the image was also there during the process. But it was broken with my two other forums.

My next upgrade of a live site is planned for Saturday. We'll see.
 
I can only reproduce this intermittently on Firefox, but we're not doing anything strange here (it's just a normal SVG <img> and the address is correct even when it does not display), so I'm left to believe this is some kind of browser issue.
 
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