Initialize the visited set

src/HotChocolate/Core/src/Types/Configuration/Validation/InputObjectTypeValidationRule.cs

@@ -26,6 +26,7 @@ public void Validate(
         List<string>? names = null;
         CycleValidationContext cycleValidationContext = new()
         {
+            Visited = new(),
             CycleStartIndex = new(),
             Errors = errors,
             FieldPath = new(),