The Mass Fabricator will create the item in the output slot regardless of the type of item. This is due to the Mass Fabricator increasing the amount of the itemstack in the output slot by 1 (MassFabricator.java#L126) without prior checking on whether the item in the output slot is a UU-Matter.
Steps to reproduce the Issue (REQUIRED)
Insert an item into the output slot of the Mass Fabricator by selecting the item and hold right click while hovering over the output slot.
Insert sufficient Scrap to produce a UU-Matter (200 Scrap) into the input slot of the Mass Fabricator.
The itemstack in the output slot will increase by 1.
GIF showing the creation of a Cargo Node (Output):
Expected behavior (REQUIRED)
The Mass Fabricator should not work if the output slot has an itemstack that is not UU-Matter.
Server Log
There is no errors.
Environment (REQUIRED)
Server Software (Spigot/Paper): Paper v1_16_R3 (git-Paper-279)
Description (REQUIRED)
The Mass Fabricator will create the item in the output slot regardless of the type of item. This is due to the Mass Fabricator increasing the amount of the itemstack in the output slot by 1 (MassFabricator.java#L126) without prior checking on whether the item in the output slot is a UU-Matter.
Steps to reproduce the Issue (REQUIRED)
GIF showing the creation of a Cargo Node (Output):
Expected behavior (REQUIRED)
The Mass Fabricator should not work if the output slot has an itemstack that is not UU-Matter.
Server Log
There is no errors.
Environment (REQUIRED)