diff --git a/.github/workflows/update-antora-ui-spring.yml b/.github/workflows/update-antora-ui-spring.yml
index 6091232b..314ff0dc 100644
--- a/.github/workflows/update-antora-ui-spring.yml
+++ b/.github/workflows/update-antora-ui-spring.yml
@@ -16,7 +16,7 @@ jobs:
     name: Update on Supported Branches
     strategy:
       matrix:
-        branch: [ '1.3.x', 'main' ]
+        branch: [ '1.3.x', '1.4.x', 'main' ]
     steps:
       - uses: spring-io/spring-doc-actions/update-antora-spring-ui@e28269199d1d27975cf7f65e16d6095c555b3cd0 # v0.0.20
         name: Update
diff --git a/spring-graphql/src/main/java/org/springframework/graphql/data/ArgumentValue.java b/spring-graphql/src/main/java/org/springframework/graphql/data/ArgumentValue.java
index 3f5e26ab..66e24a44 100644
--- a/spring-graphql/src/main/java/org/springframework/graphql/data/ArgumentValue.java
+++ b/spring-graphql/src/main/java/org/springframework/graphql/data/ArgumentValue.java
@@ -136,6 +136,12 @@ public final class ArgumentValue<T> {
 		return result;
 	}
 
+	@Override
+	public String toString() {
+		String v = ((this.value != null) ? this.value.toString() : (this.omitted) ? "omitted" : "empty");
+		return "ArgumentValue[" + v + "]";
+	}
+
 
 	/**
 	 * Static factory method for an argument value that was provided, even if
diff --git a/spring-graphql/src/main/java/org/springframework/graphql/data/query/QuerydslDataFetcher.java b/spring-graphql/src/main/java/org/springframework/graphql/data/query/QuerydslDataFetcher.java
index e3cc64aa..7e1ebe62 100644
--- a/spring-graphql/src/main/java/org/springframework/graphql/data/query/QuerydslDataFetcher.java
+++ b/spring-graphql/src/main/java/org/springframework/graphql/data/query/QuerydslDataFetcher.java
@@ -158,13 +158,14 @@ public abstract class QuerydslDataFetcher<T> {
 			@Nullable String prefix, Map<String, Object> arguments, MultiValueMap<String, Object> parameters) {
 
 		for (Map.Entry<String, Object> entry : arguments.entrySet()) {
+			String key = ((prefix != null) ? prefix + "." : "") + entry.getKey();
 			Object value = entry.getValue();
 			if (value instanceof Map<?, ?> nested) {
-				addParameters(entry.getKey(), (Map<String, Object>) nested, parameters);
+				addParameters(key, (Map<String, Object>) nested, parameters);
 				continue;
 			}
 			List<Object> values = (value instanceof List) ? (List<Object>) value : Collections.singletonList(value);
-			parameters.put(((prefix != null) ? prefix + "." : "") + entry.getKey(), values);
+			parameters.put(key, values);
 		}
 	}
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/ArgumentValueTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/ArgumentValueTests.java
index fdfa4f0a..ca3ff970 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/ArgumentValueTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/ArgumentValueTests.java
@@ -80,4 +80,10 @@ class ArgumentValueTests {
 		assertThat(called.get()).isFalse();
 	}
 
+	@Test
+	void toStringValue() {
+		assertThat(ArgumentValue.omitted()).hasToString("ArgumentValue[omitted]");
+		assertThat(ArgumentValue.ofNullable(null)).hasToString("ArgumentValue[empty]");
+		assertThat(ArgumentValue.ofNullable("hello")).hasToString("ArgumentValue[hello]");
+	}
 }