Img source on ionic list not showing when scrolled to

I have a an ionic-list that scrolls off the window and whose ion-item members are class item-thumbnail-left.

Both in the browser and on Android I find that the source of img elements whose parent ion-item members are hidden off-page do not show when scrolled to. This results in a list with missing thumbnails.

I have reviewed all ionic scroll and list docs, but can find no insight into this challenge.

Thanks,

G

Unmentioned above, the ion-list had the show-reorder attribute enabled. I disabled it and the images returned to the display, even under scrolling. I am unwilling to debug further, so I would simply caution future readers about their use of show-reorder.