When doing an episode search the thumbnails are not being populated with images.
Can you share a screenshot of what you’re referring to?
“Episode Search” has gotten worse and is FUBAR …
Notice how an episode search for “Building the Eiffel Tower” reported back garbage instead of the specific “Nova” episode and that the garbage episodes reported had blank images (original bug report).
The missing images is a bug I will look into. The episode search results are currently re-indexing and should return to normal in a few hours.