Issues with SharePoint Product Catalog (Classic)

You’ve confirmed Catalog-Item Reuse content renders until search web parts are added. Microsoft documents that reuse snippets depend on one Catalog-Item Reuse data-provider web part; if its catalog query stops returning an item, dependent fields can be blank.

On a page copy: 1) ensure that provider remains in the Body zone; 2) test its query for an affected URL and confirm its catalog result source; 3) add search web parts individually, checking their result sources; 4) verify the catalog list is searchable, and reindex it only after a schema or property-mapping change; 5) review Custom script, because Microsoft lists these search parts and Catalog-Item Reuse as affected when scripting is blocked. I can’t confirm a documented known issue. Microsoft now states cross-site publishing is unavailable in SharePoint Online, so if this remains, check Service health and open a SharePoint support request with the URL, UTC time, and any correlation ID.