11.0.4: * [Mail/Routing] Fixed a bug in mail routing when an automati…

…on or bot behavior overrode the `In-Reply-To:` or `References:` headers. In certain conditions, this didn't remove the inherited group/bucket from the previous parent ticket. As a result, Routing KATA or legacy mail routing rules didn't re-route the message as expected.

api/app/Parser.php

@@ -320,6 +320,12 @@ private function _parseHeadersIsNew() {
 
 		$senderWorker = $this->getSenderWorkerModel();
 
+		// Reset the parent ticket and routing when we start
+		$this->_is_new = true;
+		$this->_message_id = 0;
+		$this->setTicketModel(null);
+		$this->setRouteGroup(null);
+
 		$aReferences = [];
 
 		// Append first <*> from In-Reply-To
@@ -423,11 +429,6 @@ private function _parseHeadersIsNew() {
 				}
 			}
 		}
-
-		$this->_is_new = true;
-		$this->_ticket_id = 0;
-		$this->_ticket_model = null;
-		$this->_message_id = 0;
 	}
 
 	public function getRecipients() : array {