Fix #7074 report a single field error from aggregate resolver exceptions

src/HotChocolate/Core/src/Types/Execution/Processing/MiddlewareContext.Global.cs

@@ -60,16 +60,16 @@ public void ReportError(Exception exception, Action<ErrorBuilder>? configure = n
 
         if (exception is GraphQLException ex)
         {
-            foreach (var error in ex.Errors)
+            if (ex.Errors.Count > 0)
             {
-                ReportError(error);
+                ReportError(ex.Errors[0]);
             }
         }
         else if (exception is AggregateException aggregateException)
         {
-            foreach (var innerException in aggregateException.InnerExceptions)
+            if (aggregateException.InnerExceptions.Count > 0)
             {
-                ReportError(innerException);
+                ReportError(aggregateException.InnerExceptions[0]);
             }
         }
         else

src/HotChocolate/Core/test/Execution.Tests/Errors/Issue7074ReproTests.cs

@@ -0,0 +1,29 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace HotChocolate.Execution.Errors;
+
+public class Issue7074ReproTests
+{
+    [Fact]
+    public async Task Aggregate_GraphQLException_Produces_Only_One_Field_Error()
+    {
+        var executor = await new ServiceCollection()
+            .AddGraphQL()
+            .AddQueryType<Query>()
+            .BuildRequestExecutorAsync();
+
+        var result = await executor.ExecuteAsync("{ test }");
+        var json = result.ToJson();
+
+        Assert.Contains("Test1", json, StringComparison.Ordinal);
+        Assert.DoesNotContain("Test2", json, StringComparison.Ordinal);
+    }
+
+    public class Query
+    {
+        public string Test()
+            => throw new AggregateException(
+                new GraphQLException("Test1"),
+                new GraphQLException("Test2"));
+    }
+}