Why have Farm Heroes Super Saga & Pepper Panic Saga disappeared from my games on Fb Arcade?

Both Farm Heroes Super Saga & Pepper Panic Saga have disappeared from the list of My Games on Facebook Arcade. When I opened it up there were games I do not play in the list which I deleted but those two had gone. Also when I search for these games they apparently don't exist but are still visible  (and on my list) on my main Facebook page. What is happening?