Fix replay flow corrupting the main-flow scene pointer

server/internal/questflow/quest.go

@@ -259,7 +259,12 @@ func (h *QuestHandler) HandleQuestFinish(user *store.UserState, questId int32, i
 	if !isRetired {
 		h.applyQuestVictory(user, questId, &outcome, nowMillis, wasReplay)
 
-		if isMainQuestPlayable(quest) && !wasMenuReplay {
+		// A replay-flow finish must NOT move the MainFlow scene pointer: the
+		// finished quest is a replay-variant (30000+) with no chapter, so a
+		// replay scene left in CurrentQuestSceneId makes the client world map's
+		// CalculatorWorldMap.GetCurrentSeasonId resolve chapter 0 and NRE. The
+		// replay's own position is tracked in ReplayFlowCurrentQuestSceneId.
+		if isMainQuestPlayable(quest) && !wasMenuReplay && !wasReplay {
 			lastSceneId := h.getLastMainFlowSceneId(questId)
 			h.advanceMainFlowScene(user, questId, lastSceneId)
 		}

server/internal/questflow/scene.go

@@ -233,7 +233,10 @@ func (h *QuestHandler) HandleMainQuestSceneProgress(user *store.UserState, quest
 			user.MainQuest.CurrentQuestFlowType = int32(model.QuestFlowTypeSubFlow)
 			user.MainQuest.ProgressQuestFlowType = int32(model.QuestFlowTypeSubFlow)
 		}
-	} else {
+	} else if !isReplay {
+		// Background/non-playable quest: advance the MainFlow pointer — but not
+		// during a replay, where the isReplay block below tracks the ReplayFlow
+		// scene and the MainFlow pointer must stay on real main-story progress.
 		user.MainQuest.CurrentQuestSceneId = questSceneId
 		if h.isSceneAhead(questSceneId, user.MainQuest.HeadQuestSceneId) {
 			user.MainQuest.HeadQuestSceneId = questSceneId