XF 1.5 One animated shows, one doesn't, what is up?

What do you have set for the "Image Cache Max Size (Kilobytes)" option? The latter image is fairly large, though not bigger than the default value (5 MB). If it's bigger, it won't embed though.
There's a schedule for resolving failed attempts that tries less frequently over time (eventually not trying again). You can try using the ACP management tools to try forcing a refresh.
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