diff --git a/lntest/itest/lnd_test.go b/lntest/itest/lnd_test.go
index d3a86d4f..fcf21ea0 100644
--- a/lntest/itest/lnd_test.go
+++ b/lntest/itest/lnd_test.go
@@ -11787,7 +11787,15 @@ func testSwitchOfflineDelivery(net *lntest.NetworkHarness, t *harnessTest) {
 			err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	// Make sure all nodes are fully synced before we continue.
+	ctxt, cancel := context.WithTimeout(ctxb, defaultTimeout)
+	defer cancel()
+	for _, node := range nodes {
+		err := node.WaitForBlockchainSync(ctxt)
+		if err != nil {
+			t.Fatalf("unable to wait for sync: %v", err)
+		}
+	}
 
 	// Using Carol as the source, pay to the 5 invoices from Bob created
 	// above.
@@ -11856,6 +11864,16 @@ func testSwitchOfflineDelivery(net *lntest.NetworkHarness, t *harnessTest) {
 		t.Fatalf("htlc mismatch: %v", predErr)
 	}
 
+	// Make sure all nodes are fully synced again.
+	ctxt, cancel = context.WithTimeout(ctxb, defaultTimeout)
+	defer cancel()
+	for _, node := range nodes {
+		err := node.WaitForBlockchainSync(ctxt)
+		if err != nil {
+			t.Fatalf("unable to wait for sync: %v", err)
+		}
+	}
+
 	// Now that the settles have reached Dave, reconnect him with Alice,
 	// allowing the settles to return to the sender.
 	ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
diff --git a/lntest/itest/log_error_whitelist.txt b/lntest/itest/log_error_whitelist.txt
index 2496b070..665b3266 100644
--- a/lntest/itest/log_error_whitelist.txt
+++ b/lntest/itest/log_error_whitelist.txt
@@ -155,6 +155,7 @@
 <time> [ERR] NTFN: unable to get hash from block with height 790
 <time> [ERR] NTFN: unable to get missed blocks: starting height <height> is greater than ending height <height>
 <time> [ERR] NTFN: Unable to rewind chain from height <height> to height <height>: unable to find blockhash for disconnected height=<height>: -1: Block number out of range
+<time> [ERR] NTFN: Unable to rewind chain from height <height> to height <height>: unable to find blockhash for disconnected height=<height>: -8: Block height out of range
 <time> [ERR] NTNF: unable to get hash from block with height <height>
 <time> [ERR] PEER: Allowed test error from <ip> (inbound): ReadMessage: unhandled command [sendaddrv2]
 <time> [ERR] PEER: resend failed: unable to fetch channel sync messages for peer <hex>@<ip>: unable to find closed channel summary
diff --git a/lntest/itest/log_substitutions.txt b/lntest/itest/log_substitutions.txt
index c5270bd5..6f24b09f 100644
--- a/lntest/itest/log_substitutions.txt
+++ b/lntest/itest/log_substitutions.txt
@@ -10,7 +10,7 @@ s/HTLC ID = [[:digit:]]+/HTLC ID = <id>/g
 s/height=[[:digit:]]+/height=<height>/g
 s/collecting result for shard [[:digit:]]+/collecting result for shard <number>/g
 s/sending attempt [[:digit:]]+/sending attempt <number>/g
-s/Unable to rewind chain from height [[:digit:]]+ to height [[:digit:]]+/Unable to rewind chain from height <height> to height <height>/g
+s/Unable to rewind chain from height [[:digit:]]+ to height -?[[:digit:]]+/Unable to rewind chain from height <height> to height <height>/g
 s/NTFN: unable to get missed blocks: starting height [[:digit:]]+ is greater than ending height [[:digit:]]+/NTFN: unable to get missed blocks: starting height <height> is greater than ending height <height>/g
 s/BTCN: Broadcast attempt failed: rejected by <ip>: replacement transaction <hex> has an insufficient fee rate: needs more than [[:digit:]]+, has [[:digit:]]+/BTCN: Broadcast attempt failed: rejected by <ip>: replacement transaction <hex> has an insufficient fee rate: needs more than <amt>, has <amt>/g
 s/pid=[[:digit:]]+/pid=<pid>/g