Not sending a roundchange message when receiving an invalid proposal in preprepare

consensus/qibft/core/preprepare.go

@@ -105,9 +105,6 @@ func (c *core) handlePreprepare(msg *message, src istanbul.Validator) error {
 					msg: msg,
 				})
 			})
-		} else {
-			logger.Warn("Failed to verify proposal", "err", err, "duration", duration)
-			c.sendNextRoundChange()
 		}
 		return err
 	}