This applies to Minecraft 1.18.2/Fabric 0.13.3/Polymorph 0.0.20 with [Fabric] Expanded Storage 7.3.11. I have not tested on any other (i.e., older) versions.

Please describe the new feature or change.
Currently, the Polymorph button does not appear in the furnace UI when Expanded Storage is installed and furnace recipe conflicts exist.

Please describe why you want this feature.
Because I want to be able to switch furnace recipes with expanded storage installed.

PS
I have reported this as a bug in Expanded Storage as well, since that mod doesn't actually do anything with furnaces per se.