Add new error message for unrecognized cross domain messages

x/rollup/keeper/deposits.go

@@ -122,9 +122,10 @@ func (k *Keeper) processL1UserDepositTxs(
 			// Do not return an error if the cross domain message can't be parsed or executed to keep the
 			// state transitions from the other deposit txs
 			if err != nil {
-				// TODO: should this log be a warning or error?
 				ctx.Logger().Warn("Failed to parse or execute cross domain message", "err", err)
-			} else if erc20mintEvent != nil {
+			} else if erc20mintEvent == nil {
+				ctx.Logger().Warn("Cross domain message not recognized", "txData", tx.Data())
+			} else {
 				mintEvents = append(mintEvents, *erc20mintEvent)
 			}
 		}