Using version 1.19.2-21.0.4, with no other mods (to test). The mod's buttons fail to appear in the GUI of any of the storage blocks (chests, barrels), therefore this mod is unusable or basically nonexistent; no crashes, no errors, but simply does not seem to exist despite having it installed.

I have the same issue with the same version ( 1.19.2-21.0.4 )
[EDIT] This may be intentional but 'Inventory Sorter' only work in 'survival'