Description (Required)

The nether brick smeltery found under basic machines does not recognize the last slot in its inventory (bottom right side).

Steps to reproduce the Issue (Required)

1. Fill the smeltery with quartz blocks in the following pattern:
   [ 0 ][64][64]
   [64][64][64]
   [64][64][64]
   (This is just an example recipe, it can be replaced with iron dust and other recipes).
2. Smelt all of the quartz blocks into silicon.
3. Observe that the last slot in the smeltery still contains quartz blocks, and that right-clicking it tells you that it does not recognize the recipe.

Expected behavior (Required)

The final slot should be smelted. (In the example, all the quartz should be turned to silicon).

Server Log / Error Report

No error

Environment (Required)

Minecraft Version: 1.15.2
Slimefun Version: vDEV-511 (git c51ff84)
CS-CoreLib Version: vDEV-85 (git 4a7fce52)