Classic eBay stores which are customized are supposed to function until some time next year. I've started hearing from my store owner/eBay seller design clients about broken links to custom pages and store searches.
The long-time links may have been http://stores.shop.ebay.com/StoreName/custompage. I had to change the first part of the URLs to https://www.ebaystores.com. It is not right that sellers have to pay for fixes when eBay is jumping the gun and breaking things in eBay stores which should be functional for several more months.