Change to void

patches/net/minecraft/tileentity/TileEntity.java.patch

@@ -62,7 +62,7 @@
 +        return this.GC; //Returns true if the chunk it is inside of has marked it for unloading
 +    }
 +
-+    public boolean setGC(boolean state) 
++    public void setGC(boolean state) 
 +    {
 +        this.GC = state; //Should never be touched by a mod. Would make it package-private but not sure if that would still work
 +    }