Contacted chat support and. among the four paragraphs of automated reply, they told me that “availability may change from time to time depending on our agreements with content owners.”
When I asked if this was likely to happen again, to shows that I had saved to my watchlist, “Showry” replied, “Yes Perry. It will likely happen, due to agreements with the studios/content owners.”
Sounds like a bait-and-switch to get me into a show, and then make me buy or rent it to finish watching.
Obviously I won’t be doing the Prime membership.