Found a quick workaround. Add a featured collection on the Home Page on your theme editor and click the product manually there. Then it'll take you to the product and you can edit the content there

This started last night for me (12ish hours ago). Haven't seen any similar topics on Shopify Community so wonder if this is a personal account thing or Shopify-wide Hopefully gets figured out soon

Same problem here. Haven't found a fix after clearing browser, new browsers, new device, even new theme. Wondering if it's from Shopify's end