diff --git a/csharp/test/Apache.Arrow.Tests/ArrowArrayConcatenatorTests.cs b/csharp/test/Apache.Arrow.Tests/ArrowArrayConcatenatorTests.cs
index 80c5e586963d2..bdc5051072b90 100644
--- a/csharp/test/Apache.Arrow.Tests/ArrowArrayConcatenatorTests.cs
+++ b/csharp/test/Apache.Arrow.Tests/ArrowArrayConcatenatorTests.cs
@@ -29,12 +29,6 @@ public void TestStandardCases()
         {
             foreach ((List<IArrowArray> testTargetArrayList, IArrowArray expectedArray) in GenerateTestData())
             {
-                if (expectedArray is UnionArray)
-                {
-                    // Union array concatenation is incorrect. See https://github.com/apache/arrow/issues/41198
-                    continue;
-                }
-
                 IArrowArray actualArray = ArrowArrayConcatenator.Concatenate(testTargetArrayList);
                 ArrowReaderVerifier.CompareArrays(expectedArray, actualArray);
             }
@@ -410,15 +404,11 @@ public void Visit(UnionType type)
 
                     for (int j = 0; j < dataList.Count; j++)
                     {
-                        bool includeInResult = IncludeInResult(i, j);
                         byte index = (byte)Math.Min(j % 3, 1);
                         int? intValue = (index == 1) ? dataList[j] : null;
                         string stringValue = (index == 1) ? null : dataList[j]?.ToString();
                         typeBuilder.Append(index);
-                        if (includeInResult)
-                        {
-                            typeResultBuilder.Append(index);
-                        }
+                        typeResultBuilder.Append(index);
 
                         if (isDense)
                         {