diff --git a/proxy/shadowsocks_2022/relay_test.go b/proxy/shadowsocks_2022/relay_test.go
index ccf870d1b..096852ca6 100644
--- a/proxy/shadowsocks_2022/relay_test.go
+++ b/proxy/shadowsocks_2022/relay_test.go
@@ -374,98 +374,3 @@ func TestRelayTCPHandshakeForwarding(t *testing.T) {
 		})
 	}
 }
-
-// SIP022 §3.2.4: a relay session is routed by client session ID, not by source address.
-// After the client moves to a new source address, the inbound worker of the old address
-// eventually expires and its context is canceled; the session must survive that.
-func TestUDPSessionSurvivesOldSourceExpiry(t *testing.T) {
-	method, err := GetCipherMethod(MethodAES128GCM)
-	common.Must(err)
-	key := make([]byte, method.KeySaltLength)
-	_, _ = rand.Read(key)
-
-	inbound, err := NewServer(newTestContext(), &ServerConfig{
-		Method: MethodAES128GCM,
-		Key:    base64.StdEncoding.EncodeToString(key),
-	})
-	common.Must(err)
-
-	var dispatchCount atomic.Int32
-	var received atomic.Int32
-	disp := &dummyDispatcher{
-		onDispatch: func(ctx context.Context, d net.Destination) (*transport.Link, error) {
-			dispatchCount.Add(1)
-			linkR, linkW := gonet.Pipe()
-			// Like a real outbound, end the link when the dispatch context is canceled.
-			go func() {
-				<-ctx.Done()
-				linkW.Close()
-				linkR.Close()
-			}()
-			t.Cleanup(func() {
-				linkW.Close()
-				linkR.Close()
-			})
-			return &transport.Link{
-				Reader: buf.NewReader(linkR),
-				Writer: &customWriter{write: func(mb buf.MultiBuffer) error {
-					received.Add(int32(len(mb)))
-					buf.ReleaseMulti(mb)
-					return nil
-				}},
-			}, nil
-		},
-	}
-
-	clientCodec, err := NewUDPPacketCodec(method, [][]byte{key})
-	common.Must(err)
-	session, err := clientCodec.NewClientSession()
-	common.Must(err)
-	dest := net.UDPDestination(net.LocalHostIP, 443)
-	send := func(conn gonet.Conn) {
-		pkt, err := session.EncodePacket(dest, []byte("payload"))
-		common.Must(err)
-		defer pkt.Release()
-		if _, err := conn.Write(pkt.Bytes()); err != nil {
-			t.Fatal(err)
-		}
-	}
-	process := func(ctx context.Context) gonet.Conn {
-		clientConn, serverConn := gonet.Pipe()
-		t.Cleanup(func() {
-			clientConn.Close()
-			serverConn.Close()
-		})
-		go func() {
-			_ = inbound.Process(ctx, net.Network_UDP, &dummyStatConn{Conn: serverConn}, disp)
-		}()
-		return clientConn
-	}
-
-	ctxA, cancelA := context.WithCancel(newTestContext())
-	defer cancelA()
-	connA := process(ctxA)
-	send(connA)
-
-	// The client's source address changes.
-	ctxB, cancelB := context.WithCancel(newTestContext())
-	defer cancelB()
-	connB := process(ctxB)
-	send(connB)
-	time.Sleep(50 * time.Millisecond)
-
-	// The inbound worker of the old address expires.
-	cancelA()
-	connA.Close()
-	time.Sleep(50 * time.Millisecond)
-
-	send(connB)
-	time.Sleep(50 * time.Millisecond)
-
-	if n := dispatchCount.Load(); n != 1 {
-		t.Fatalf("session was dispatched %d times, want 1", n)
-	}
-	if n := received.Load(); n != 3 {
-		t.Fatalf("received %d packets, want 3", n)
-	}
-}
diff --git a/proxy/shadowsocks_2022/shadowsocks_2022_test.go b/proxy/shadowsocks_2022/shadowsocks_2022_test.go
index b7a600194..382696efb 100644
--- a/proxy/shadowsocks_2022/shadowsocks_2022_test.go
+++ b/proxy/shadowsocks_2022/shadowsocks_2022_test.go
@@ -496,60 +496,3 @@ func TestClientUDPSessionMultiDestination(t *testing.T) {
 		})
 	}
 }
-
-// Packets of one client session may be decoded concurrently, e.g. by the inbound
-// workers of the client's old and new source address after a NAT rebinding.
-func TestUDPServerConcurrentDecodeSameSession(t *testing.T) {
-	for _, methodName := range []string{MethodAES128GCM, MethodAES256GCM, MethodChaCha20Poly1305} {
-		t.Run(methodName, func(t *testing.T) {
-			method, err := GetCipherMethod(methodName)
-			common.Must(err)
-			rawKey := make([]byte, method.KeySaltLength)
-			_, _ = rand.Read(rawKey)
-
-			clientCodec, err := NewUDPPacketCodec(method, [][]byte{rawKey})
-			common.Must(err)
-			serverCodec, err := NewUDPServerCodec(method, rawKey, time.Minute)
-			common.Must(err)
-			session, err := clientCodec.NewClientSession()
-			common.Must(err)
-
-			dest := net.UDPDestination(net.LocalHostIP, net.Port(443))
-			packets := make([][]byte, 256)
-			for i := range packets {
-				pkt, err := session.EncodePacket(dest, []byte("payload"))
-				common.Must(err)
-				packets[i] = append([]byte(nil), pkt.Bytes()...)
-				pkt.Release()
-			}
-
-			const workers = 4
-			var wg sync.WaitGroup
-			var mu sync.Mutex
-			accepted := make([]int, len(packets))
-			for w := 0; w < workers; w++ {
-				wg.Add(1)
-				go func() {
-					defer wg.Done()
-					// Every worker sees every packet, so each packet must be accepted exactly once.
-					for i, pkt := range packets {
-						if _, err := serverCodec.DecodePacket(pkt); err == nil {
-							mu.Lock()
-							accepted[i]++
-							mu.Unlock()
-						} else if err != ErrPacketIdNotUnique {
-							t.Errorf("packet %d: unexpected error: %v", i, err)
-						}
-					}
-				}()
-			}
-			wg.Wait()
-
-			for i, n := range accepted {
-				if n != 1 {
-					t.Fatalf("packet %d accepted %d times, want 1", i, n)
-				}
-			}
-		})
-	}
-}