See also: The help forum on the discord, post “Optimise optimises on less reviews than expected”
In essence, I believe the FSRS optimiser ignores cards which have a first review log that is from set due date (see image 1). I moved a selection of such cards to a test deck, and even though they had some reviews, FSRS reported no reviews to optimise upon (images 2, 3). Furthermore, in my original deck, TR would suggest some 900 reviews, but FSRS only optimises on 86 (I introduced most, but not all, cards in that deck via set due date)




