Item thumbnails exist but do not load on initial route

[AndrewZachWood]

When I generate thumbnails for items they do not load initially. I can refresh the page but even after I've cleared all related cache I have to re-route the the item for the thumbnail to display.

To reproduce:
Submit a new item.
Run the filter media process.
Route to your new item.
Verify the "No Thumbnail" default display.
Press the back button.
Re-route to the your new item.
Notice the thumbnail now displays.

It's unclear to me why re-routing to an item after initially routing to the item would display the thumbnail.

[cwilper]

Note: At first glance this might look similar to #797 but it is different: This is a case where thumbnails that were generated long ago (many restarts and browser cache clears) will not display on initial page display, and only after you browse through the interface are they finally displayed for the user.

[tdonohue]

@cwilper or @AndrewZWood : Have you done any further analysis of the issue here? This seems like something we may want to solve in 7.0, but also seems low priority. If you don't feel experienced enough to figure out the issue, we could also pull in @artlowel or someone on his team.

For now, moving this to 7.0 board, flagging as low priority & assigning back to @cwilper and @AndrewZWood (please give feedback on whether I should reassign it though)

[tdonohue]

Per today's meeting, I'm reassigning this to @artlowel so that he can delegate to appropriate team members to analyze the issue.