Another route of ensuring /help goes through to Bedrock

core/src/main/java/org/geysermc/geyser/translator/protocol/java/JavaCommandsTranslator.java

@@ -88,6 +88,7 @@ public class JavaCommandsTranslator extends PacketTranslator<ClientboundCommands
             if (a == null || b == null) return false;
             if ("help".equals(a.name()) && !"help".equals(b.name())) {
                 // Merging this causes Bedrock to fallback to its own help command
+                // Tested on Paper 1.20.4 with Essentials and Bedrock 1.21
                 // https://github.com/GeyserMC/Geyser/issues/2573
                 return false;
             }
@@ -182,6 +183,8 @@ public class JavaCommandsTranslator extends PacketTranslator<ClientboundCommands
         // The command flags, set to NOT_CHEAT so known commands can be used while achievements are enabled.
         Set<CommandData.Flag> flags = Set.of(CommandData.Flag.NOT_CHEAT);
 
+        boolean helpAdded = false;
+
         // Loop through all the found commands
         for (Map.Entry<BedrockCommandInfo, Set<String>> entry : commands.entrySet()) {
             String commandName = entry.getValue().iterator().next(); // We know this has a value
@@ -198,6 +201,18 @@ public class JavaCommandsTranslator extends PacketTranslator<ClientboundCommands
             // Build the completed command and add it to the final list
             CommandData data = new CommandData(commandName, entry.getKey().description(), flags, CommandPermission.ANY, aliases, Collections.emptyList(), entry.getKey().paramData());
             commandData.add(data);
+
+            if (commandName.equals("help")) {
+                helpAdded = true;
+            }
+        }
+
+        if (!helpAdded) {
+            // https://github.com/GeyserMC/Geyser/issues/2573 if Brigadier does not send the help command.
+            CommandEnumData aliases = new CommandEnumData("helpAliases", Map.of("help", EnumSet.of(CommandEnumConstraint.ALLOW_ALIASES)), false);
+
+            CommandData data = new CommandData("help", "", flags, CommandPermission.ANY, aliases, Collections.emptyList(), new CommandOverloadData[0]);
+            commandData.add(data);
         }
 
         // Add our commands to the AvailableCommandsPacket for the bedrock client