From bd71ce6071e7b8d942e299debf432e2dcc2c927e Mon Sep 17 00:00:00 2001
From: Erza Bytyci <erzabytyqi17@gmail.com>
Date: Mon, 28 Sep 2026 17:51:03 +0000
Subject: [PATCH] improve gap exercises

---
 gradesa/src/app/admin/create-exercise/fillinthegap/page.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gradesa/src/app/admin/create-exercise/fillinthegap/page.js b/gradesa/src/app/admin/create-exercise/fillinthegap/page.js
index 4aedce0..d3d30a7 100644
--- a/gradesa/src/app/admin/create-exercise/fillinthegap/page.js
+++ b/gradesa/src/app/admin/create-exercise/fillinthegap/page.js
@@ -333,12 +333,16 @@ export default function CreateFillInTheGapExercisePage() {
     setError("");
 
     try {
+      // Re-derive token_index from the current tokenization on every save so legacy
+      // exercises self-heal instead of persisting stale indices from older tokenizers.
+      const healedGaps = remapGapsToTokens(gaps, tokens);
+
       const payload = {
         title,
         instructionText,
         text,
         textHtml,
-        gaps,
+        gaps: healedGaps,
       };
 
       if (isEditMode) {