Prices in collections are wrong. At least the 11x14" ones (I always set this size as default) - it seems the oversized price is shown.
Prices in collections of puzzles published with the “this size only” option are wrong and all the same on all published sizes.
11x14" + 16x20" puzzles published with the “this size only” option don’t show the 30/52 pieces oversized variant anymore (worked fine before - the option only influenced the size, not the pieces).
The 16x20" oversized option text misses the term “oversized” (“16” x 20", 56 pieces" instead of “16” x 20", 56 oversized pieces" like on 11x14 size - was fine, too, before)
The pricing issue is solved but noticed that the 11x14 and 16x20" oversized variants still don’t show up when published with this-size-only option. This worked well before, at these two sizes, you could choose between the regular and the oversized pieces. See OP for details.
I have taken a look at a blank jigsaw puzzle and I don’t see the option for oversized pieces on either of those sizes. Am I misunderstanding the issue?
Before you made some changes, when you published a puzzle at a specific size with “this size only”, if that size had regular and oversized pieces as options, the published product showed both piece options at the size you specified. E.g. the 30 oversized and the 252 regular pieces on the 11x14" size. Now it just shows the 252-pieces option at 11x14", and you have to unnecessarily publish a second variant for the 30-piece option. Ditto for the 16x20" size.