Title kind of says it.

When:
Viewing either an entire TV series page, or a page for a single season, and none of the season or series is in my collection, I click the icon on the right of the 'ADD TO COLLECTION' button with the clock and the +, then select 'Release Date'
(Add entire season/series by release date to my collection)

I expect:
The green button to turn full-green, temporarily saying 'ADD TO COLLECTION' and 'just now', whilst at the same time a black bar shows at the bottom of the screen saying 'CACHING YOUR DATA'.
When the black bar disappears, I expect the green button to update, showing quantity of episodes collected.

But instead:
The black caching bar never appears, the green button is left saying 'ADD TO COLLECTION' and 'just now'
No individual episodes show as collected if I scroll down to where they show or navigate to their pages.

The UI is now in an inconsistent state; you cannot bulk-remove collected episodes nor re-bulk-add them. The only way to force the cache to re-trigger is to go to a single episode in the series and click it's green 'collect' icon, which then triggers the 'CACHING' black bar, and all episodes suddenly appear collected except the one I just clicked.