This is with version 5.16.0 of the Bible! app running on iOS 10.3.1
I have a number of reading plans visible on my iPad as shown below

After reading a section, marking the plan as read in the resource, and going back to the homepage the book cover for that resource is missing

It does reappear shortly afterwards. I don't think I have seen this behaviour in previous versions of the Logos app so thought it worth flagging here.