fix: missing data source content for shared elements (baserow#5354)

Author: jrmi

changelog/entries/unreleased/bug/fix_missing_data_source_content_in_collection_element_in_pag.json

@@ -0,0 +1,9 @@
+{
+    "type": "bug",
+    "message": "Fix missing data source content in collection element in page headers or footers",
+    "issue_origin": "github",
+    "issue_number": null,
+    "domain": "builder",
+    "bullet_points": [],
+    "created_at": "2026-05-12"
+}

web-frontend/modules/builder/elementTypes.js

@@ -904,9 +904,14 @@ export class ElementType extends Registerable {
       recordIndexPath = [0],
     } = applicationContext
 
+    const elementPage =
+      element.page_id === page.id
+        ? page
+        : this.app.$store.getters['page/getById'](builder, element.page_id)
+
     const collectionAncestry = this.getCollectionAncestry({
       element,
-      page,
+      page: elementPage,
       allowSameElement,
     })