Implement separate generation ID to ensure that messages deleted during separate tracker generation do not attempt to apply the received data to a now non-existent message

src/core/state.js

@@ -381,6 +381,32 @@ export let isPlotProgression = false;
  */
 export let isAwaitingNewMessage = false;
 
+/**
+ * Monotonically-increasing counter used to detect stale separate-mode tracker
+ * generation results. Incremented each time a new automated generation is
+ * triggered or a message deletion occurs so any in-flight (or pending) call
+ * from a previous generation can recognise that its result is no longer valid.
+ */
+let separateGenerationId = 0;
+
+/**
+ * Returns the current separate generation ID.
+ * @returns {number}
+ */
+export function getSeparateGenerationId() {
+    return separateGenerationId;
+}
+
+/**
+ * Increments and returns the new separate generation ID.
+ * Call this when starting a new generation or when a deletion
+ * invalidates any pending/in-flight generation.
+ * @returns {number} The new ID
+ */
+export function incrementSeparateGenerationId() {
+    return ++separateGenerationId;
+}
+
 /**
  * Temporary storage for pending dice roll (not saved until user clicks "Save Roll")
  */

src/systems/generation/apiClient.js

@@ -18,7 +18,8 @@ import {
     lastActionWasSwipe,
     setIsGenerating,
     setLastActionWasSwipe,
-    $musicPlayerContainer
+    $musicPlayerContainer,
+    getSeparateGenerationId
 } from '../../core/state.js';
 import { saveChatData, mirrorToSwipeInfo } from '../../core/persistence.js';
 import {
@@ -218,7 +219,7 @@ export async function switchToPreset(presetName) {
  * @param {Function} renderThoughts - UI function to render character thoughts
  * @param {Function} renderInventory - UI function to render inventory
  */
-export async function updateRPGData(renderUserStats, renderInfoBox, renderThoughts, renderInventory) {
+export async function updateRPGData(renderUserStats, renderInfoBox, renderThoughts, renderInventory, generationId = null) {
     if (isGenerating) {
         // console.log('[RPG Companion] Already generating, skipping...');
         return;
@@ -262,6 +263,14 @@ export async function updateRPGData(renderUserStats, renderInfoBox, renderThough
             });
         }
 
+        // If a generationId was provided and the counter has since been incremented
+        // (by a deletion or a newer generation), discard this result entirely.
+        // The finally block still runs to restore button state.
+        if (generationId !== null && getSeparateGenerationId() !== generationId) {
+            // console.log('[RPG Companion] ⚠️ Separate generation result discarded — superseded (genId', generationId, '!= current', getSeparateGenerationId(), ')');
+            return;
+        }
+
         if (response) {
             // console.log('[RPG Companion] Raw AI response:', response);
             const parsedData = parseResponse(response);

src/systems/integration/sillytavern.js

@@ -20,7 +20,9 @@ import {
     setIsAwaitingNewMessage,
     updateLastGeneratedData,
     updateCommittedTrackerData,
-    $musicPlayerContainer
+    $musicPlayerContainer,
+    getSeparateGenerationId,
+    incrementSeparateGenerationId
 } from '../../core/state.js';
 import { saveChatData, loadChatData, autoSwitchPresetForEntity, getSwipeData, commitTrackerDataFromPriorMessage, mirrorToSwipeInfo } from '../../core/persistence.js';
 import { i18n } from '../../core/i18n.js';
@@ -266,8 +268,13 @@ export async function onMessageReceived(data) {
         // Trigger auto-update if enabled (for both separate and external modes)
         // Only trigger if this is a newly generated message, not loading chat history
         if (extensionSettings.autoUpdate && isAwaitingNewMessage) {
+            // Capture the current generation ID before the async gap so that any
+            // message deletion (or a newer generation) that increments the counter
+            // while the 500ms timer or the API call is in-flight will cause
+            // updateRPGData to discard its result rather than stomping the UI.
+            const genId = incrementSeparateGenerationId();
             setTimeout(async () => {
-                await updateRPGData(renderUserStats, renderInfoBox, renderThoughts, renderInventory);
+                await updateRPGData(renderUserStats, renderInfoBox, renderThoughts, renderInventory, genId);
                 // Update FAB widgets and strip widgets after separate/external mode update completes
                 setFabLoadingState(false);
                 updateFabWidgets();
@@ -439,6 +446,10 @@ export function onMessageDeleted() {
 
     // console.log('[RPG Companion] 🗑️ EVENT: onMessageDeleted');
 
+    // Invalidate any pending or in-flight separate-mode generation so
+    // its result is not applied to the (now-changed) chat tail.
+    incrementSeparateGenerationId();
+
     const currentChat = getContext().chat;
 
     // Walk backward to find the new last assistant message.