Fix anvil usage in 1.19.50

core/src/main/java/org/geysermc/geyser/translator/inventory/AnvilInventoryTranslator.java

@@ -59,11 +59,13 @@ public class AnvilInventoryTranslator extends AbstractBlockInventoryTranslator {
         CraftRecipeOptionalStackRequestActionData data = (CraftRecipeOptionalStackRequestActionData) request.getActions()[0];
         AnvilContainer container = (AnvilContainer) inventory;
 
+        if (request.getFilterStrings().length != 0) {
             // Required as of 1.18.30 - FilterTextPackets no longer appear to be sent
             String name = request.getFilterStrings()[data.getFilteredStringIndex()];
-        if (!Objects.equals(name, container.getNewName())) {
+            if (!Objects.equals(name, container.getNewName())) { // TODO is this still necessary after pre-1.19.50 support is dropped?
                 container.checkForRename(session, name);
             }
+        }
 
         return super.translateRequest(session, inventory, request);
     }