diff --git a/chain/gen/gen_test.go b/chain/gen/gen_test.go
index b4b5b5908..a8cc53805 100644
--- a/chain/gen/gen_test.go
+++ b/chain/gen/gen_test.go
@@ -27,7 +27,7 @@ func testGeneration(t testing.TB, n int, msgs int) {
 	for i := 0; i < n; i++ {
 		mts, err := g.NextTipSet()
 		if err != nil {
-			t.Fatalf("error at H:%d, %s", i, err)
+			t.Fatalf("error at H:%d, %+v", i, err)
 		}
 		_ = mts
 	}
diff --git a/chain/vm/vm.go b/chain/vm/vm.go
index 85c90f3dd..549fcf8da 100644
--- a/chain/vm/vm.go
+++ b/chain/vm/vm.go
@@ -7,6 +7,7 @@ import (
 	"math/big"
 	"reflect"
 
+	commcid "github.com/filecoin-project/go-fil-commcid"
 	"github.com/filecoin-project/specs-actors/actors/abi"
 	"github.com/filecoin-project/specs-actors/actors/builtin/account"
 	"github.com/filecoin-project/specs-actors/actors/crypto"
@@ -17,6 +18,7 @@ import (
 	blockstore "github.com/ipfs/go-ipfs-blockstore"
 	cbor "github.com/ipfs/go-ipld-cbor"
 	logging "github.com/ipfs/go-log/v2"
+	mh "github.com/multiformats/go-multihash"
 	cbg "github.com/whyrusleeping/cbor-gen"
 	"go.opencensus.io/trace"
 	"golang.org/x/xerrors"
@@ -640,7 +642,7 @@ func copyRec(from, to blockstore.Blockstore, root cid.Cid, cp func(block.Block)
 	}
 
 	for _, link := range links {
-		if link.Prefix().MhType == 0 {
+		if link.Prefix().MhType == mh.IDENTITY || link.Prefix().MhType == uint64(commcid.FC_SEALED_V1) {
 			continue
 		}