When I visit the Sorcerer's Corner Shop and de-select the "show conventional items," it's hiding Autumnal Mood items that are not new.

For example, Autumnal Mood items being hidden include the straw items, last year's animals (the wild boar, ermine, fox, and so on), the pear trees and chestnut tree, the autumnal meadow pieces, and last year's seating.

The only items showing up when only "show newly added items" and "show items of the current season" are selected are items that are new this year. Moon items, the oxen, garden table, wheelbarrow, &tc.

Intuitively, things that are not new but are still part of the Autumnal Mood season should still show when only those two options are visible.