diff --git a/content-editor.js b/content-editor.js
index 1bd4d7d..9db5427 100644
--- a/content-editor.js
+++ b/content-editor.js
@@ -298,21 +298,23 @@ function makeObjCard(obj, idx, path) {
 function reindexItems(itemsEl) {
   if (!itemsEl) return;
   const path = itemsEl.dataset.arrayItems;
+  // WHY: rewrite only the index that directly follows THIS array's own path prefix.
+  // A generic "replace first [n]" rule corrupts nested arrays (e.g. deleting from
+  // services[1].specs.items rewrites the OUTER services index and scatters paths
+  // across services[0..n], producing sparse arrays and schema errors).
+  const prefix = path + '[';
   Array.from(itemsEl.children).forEach((child, i) => {
-    // Update all data-path in this child
     child.querySelectorAll('[data-path]').forEach(el => {
       const old = el.dataset.path;
-      // Replace the array index part: path[old_i] → path[new_i]
-      el.dataset.path = old.replace(/^(.+?)\[(\d+)\]/, (_,p) => p + '[' + i + ']');
+      if (typeof old !== 'string' || !old.startsWith(prefix)) return;
+      const rest = old.slice(prefix.length);
+      const bracketEnd = rest.indexOf(']');
+      const suffix = bracketEnd === -1 ? '' : rest.slice(bracketEnd);
+      el.dataset.path = prefix + i + suffix;
     });
     // Update card header
     const hdr = child.querySelector('.card-header');
     if (hdr) hdr.textContent = path + '[' + i + ']';
-    // Update str-item textarea
-    const ta = child.querySelector('textarea[data-path]');
-    if (ta && !ta.closest('.obj-card')) {
-      ta.dataset.path = path + '[' + i + ']';
-    }
   });
 }
 
diff --git a/scripts/test-content-editor-serializer.js b/scripts/test-content-editor-serializer.js
index 0f04c42..e5276b1 100644
--- a/scripts/test-content-editor-serializer.js
+++ b/scripts/test-content-editor-serializer.js
@@ -46,7 +46,7 @@ const document = {
 };
 const browserContext = { document, console, setTimeout, fetch: async () => ({ json: async () => ({ ok: true }) }) };
 vm.createContext(browserContext);
-new vm.Script(`${browserSource}\nglobalThis.__collect = collect;`).runInContext(browserContext);
+new vm.Script(`${browserSource}\nglobalThis.__collect = collect; globalThis.__reindexItems = reindexItems;`).runInContext(browserContext);
 
 assert.deepStrictEqual(JSON.parse(JSON.stringify(browserContext.__collect())), {
   title: 'Módosított',
@@ -54,4 +54,51 @@ assert.deepStrictEqual(JSON.parse(JSON.stringify(browserContext.__collect())), {
   limit: 99,
   sections: [{ id: 'first', items: ['egy', 'kettő'], settings: { visible: false, weight: 3 } }],
 });
+
+// Regression (MITHOME-30): reindexing a NESTED string array (e.g. services[1].specs.items
+// after deleting its first item) must rewrite only the item's own trailing index.
+// The old "replace first [n]" logic rewrote the OUTER array index and scattered the
+// paths across services[0..n], producing sparse arrays and validation errors like
+// "$.details.services[1].specs.items[0]: string érték szükséges".
+const nestedEls = [1, 2, 3, 4, 5, 6].map(n => ({ dataset: { path: `details.services[1].specs.items[${n}]` } }));
+const nestedItems = {
+  dataset: { arrayItems: 'details.services[1].specs.items' },
+  children: nestedEls.map(el => ({
+    querySelectorAll: selector => (selector === '[data-path]' ? [el] : []),
+    querySelector: () => null,
+  })),
+};
+browserContext.__reindexItems(nestedItems);
+assert.deepEqual(nestedEls.map(el => el.dataset.path), [
+  'details.services[1].specs.items[0]',
+  'details.services[1].specs.items[1]',
+  'details.services[1].specs.items[2]',
+  'details.services[1].specs.items[3]',
+  'details.services[1].specs.items[4]',
+  'details.services[1].specs.items[5]',
+]);
+
+// Reindexing the OUTER services array rewrites only the outer index and keeps
+// nested field paths (including nested array item indices) intact.
+const cardEls = [
+  { dataset: { path: 'details.services[2].icon' } },
+  { dataset: { path: 'details.services[2].specs.title' } },
+  { dataset: { path: 'details.services[2].specs.items[4]' } },
+];
+const firstCardEl = { dataset: { path: 'details.services[0].icon' } };
+const servicesItems = {
+  dataset: { arrayItems: 'details.services' },
+  children: [
+    { querySelectorAll: selector => (selector === '[data-path]' ? [firstCardEl] : []), querySelector: () => null },
+    { querySelectorAll: selector => (selector === '[data-path]' ? cardEls : []), querySelector: () => null },
+  ],
+};
+browserContext.__reindexItems(servicesItems);
+assert.equal(firstCardEl.dataset.path, 'details.services[0].icon');
+assert.deepEqual(cardEls.map(el => el.dataset.path), [
+  'details.services[1].icon',
+  'details.services[1].specs.title',
+  'details.services[1].specs.items[4]',
+]);
+
 console.log('Content Editor serializer regression test: OK');