In the 1.18.2 version of fabric furnaces (unsure if this happens on 1.19), you can exploit the non-100% dupe chanced furnaces by taking out the smelted item every time one finishes, and since its a guaranteed dupe every time you can make the dupe-chance 100% always.
In the 1.18.2 version of fabric furnaces (unsure if this happens on 1.19), you can exploit the non-100% dupe chanced furnaces by taking out the smelted item every time one finishes, and since its a guaranteed dupe every time you can make the dupe-chance 100% always.