Add unit test for the problem.

S7.Net.UnitTest/S7NetTestsAsync.cs

@@ -949,6 +949,33 @@ namespace S7.Net.UnitTest
             // Depending on how tests run, this can also just succeed without getting cancelled at all. Do nothing in this case.
             Console.WriteLine("Task was not cancelled as expected.");
         }
+
+        /// <summary>
+        /// Write a large amount of data and test cancellation
+        /// </summary>
+        [TestMethod]
+        public async Task Test_Async_ParseDataIntoDataItemsAlignment()
+        {
+            Assert.IsTrue(plc.IsConnected, "Before executing this test, the plc must be connected. Check constructor.");
+
+            var dataItems = new List<DataItem>
+            {
+                new DataItem
+                {
+                    DataType = DataType.DataBlock,
+                    DB = 2,
+                    VarType = VarType.S7String,
+                    Count = 5
+                },
+                new DataItem
+                {
+                    DataType = DataType.DataBlock,
+                    DB = 2,
+                    VarType = VarType.Word,
+                }
+            };
+            await plc.ReadMultipleVarsAsync(dataItems, CancellationToken.None);
+        }
         #endregion
     }
 }