diff --git a/NBitcoin/Protocol/Payloads/CompactFilterPayload.cs b/NBitcoin/Protocol/Payloads/CompactFilterPayload.cs
index b1e2f7583..56cc3bfbc 100644
--- a/NBitcoin/Protocol/Payloads/CompactFilterPayload.cs
+++ b/NBitcoin/Protocol/Payloads/CompactFilterPayload.cs
@@ -51,11 +51,11 @@ public CompactFilterPayload()
 		{
 		}
 
-		public new void ReadWrite(BitcoinStream stream)
+		public override void ReadWriteCore(BitcoinStream stream)
 		{
 			stream.ReadWrite(ref _FilterType);
 			stream.ReadWrite(ref _BlockHash);
-			stream.ReadWrite(_FilterBytes);
+			stream.ReadWriteAsVarString(ref _FilterBytes);
 		}
 	}
 
diff --git a/NBitcoin/Protocol/UnknowPayload.cs b/NBitcoin/Protocol/UnknowPayload.cs
index f412ffe09..3f1d5bf05 100644
--- a/NBitcoin/Protocol/UnknowPayload.cs
+++ b/NBitcoin/Protocol/UnknowPayload.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -43,7 +44,13 @@ public byte[] Data
 		}
 		public override void ReadWriteCore(BitcoinStream stream)
 		{
-			stream.ReadWrite(_Data);
+			if (stream.Serializing) {
+				stream.ReadWrite(_Data);
+			} else {
+				MemoryStream ms = new MemoryStream();
+				stream.Inner.CopyTo(ms);
+				_Data = ms.ToArray();
+			}
 		}
 	}
 }
diff --git a/NBitcoin/Transaction.cs b/NBitcoin/Transaction.cs
index b31c907c3..cb044469e 100644
--- a/NBitcoin/Transaction.cs
+++ b/NBitcoin/Transaction.cs
@@ -1585,8 +1585,8 @@ public virtual void ReadWrite(BitcoinStream stream)
 				if (flags != 0)
 				{
 					/* Use extended format in case witnesses are to be serialized. */
-					TxInList vinDummy = new TxInList();
-					stream.ReadWrite(ref vinDummy);
+					byte marker = 0;
+					stream.ReadWrite(ref marker);
 					stream.ReadWrite(ref flags);
 				}
 				stream.ReadWrite(ref vin);
@@ -2039,7 +2039,7 @@ public virtual bool HasWitness
 		/// Context free transaction check
 		/// </summary>
 		/// <returns>The error or success of the check</returns>
-		public TransactionCheckResult Check()
+		public virtual TransactionCheckResult Check()
 		{
 			// Basic checks that don't depend on any context
 			if (Inputs.Count == 0)