Merge pull request #8893 from filecoin-project/asr/exec-trace-v16

fix: fvm: make exectraces match legacyVM some more

chain/vm/fvm.go

@@ -344,14 +344,15 @@ func (vm *FVM) ApplyMessage(ctx context.Context, cmsg types.ChainMsg) (*ApplyRet
 			return nil, xerrors.Errorf("failed to unmarshal exectrace: %w", err)
 		}
 		et = fvmEt.ToExecutionTrace()
-	} else {
+	}
+
+	// Set the top-level exectrace info from the message and receipt for backwards compatibility
 	et.Msg = vmMsg
 	et.MsgRct = &receipt
 	et.Duration = duration
 	if aerr != nil {
 		et.Error = aerr.Error()
 	}
-	}
 
 	return &ApplyRet{
 		MessageReceipt: receipt,