detect: update packet action on protocol change

Ticket: #6305

When running FlowWorkerStreamTCPUpdate, one of the dequeued packet
may set the flow action to drop, without updating the not-pseudo
packet action, as is done usually with a previous call to
FlowHandlePacketUpdate

src/flow-worker.c

@@ -410,6 +410,10 @@ static inline void FlowWorkerStreamTCPUpdate(ThreadVars *tv, FlowWorkerThreadDat
             TmqhOutputPacketpool(tv, x);
         }
     }
+    if (FlowChangeProto(p->flow) && p->flow->flags & FLOW_ACTION_DROP) {
+        // in case f->flags & FLOW_ACTION_DROP was set by one of the dequeued packets
+        PacketDrop(p, ACTION_DROP, PKT_DROP_REASON_FLOW_DROP);
+    }
 }
 
 static void FlowWorkerFlowTimeout(ThreadVars *tv, Packet *p, FlowWorkerThreadData *fw,