Have you received this warning from your Google Search Console?
New Breadcrumbs issue detected for site https://my-shopify.com.
Search Console has identified that your site is affected by 1 Breadcrumbs issue.
You’re not alone.
This warning showed up on the console for one of my clients a few months back. But because he didn’t know what Breadcrumbs were, the issue went unchecked—and the consequences were disastrous.