use FailThrough when available

common/addons/config-palette/src/main/java/com/dfsek/terra/addons/palette/PaletteAddon.java

@@ -26,6 +26,7 @@ public class PaletteAddon extends TerraAddon {
                 .then(event -> {
                     event.getPack().registerConfigType(new PaletteConfigType(main), "PALETTE", 2);
                     event.getPack().applyLoader(PaletteLayerHolder.class, new PaletteLayerLoader());
-                });
+                })
+                .failThrough();
     }
 }