The recipe json uses the tags minecraft:gold_block and minecraft:emerald_block, however these are not real tags.

The correct tags to use are c:gold_blocks and c:emerald_blocks, or just use the item directly.

See: https://github.com/TheWinABagel/Zenith/blob/1.20/src/main/resources/data/zenith/recipes/treasure_shelf.json#L14-L25

Fixed with 1.0.1