For https://en.wikipedia.org/wiki/Pioneer_Race_Course the image used in the hovercard is the San Francisco seal, apparently from the Template:San Francisco template. This is weird, since there are four other images in the article that might be used.
Topic on Talk:Page Previews/Flow
I noticed this. It looks like "Extract" the code that pulls the image is ignoring content in galleries.
Extension:PageImages shouldn't be ignoring the first image, which is not (and was not) part of a gallery... Ping@Prtksxna: Are you familiar with this problem?
Captured in bug 72276