Sharing Debugger is a link preview editing service for Facebook. You can use it to update a page preview on Facebook by pasting the page link in the field and clicking on Debug. After that, the page preview will be updated and a new preview will be displayed below.
If you specify a link to the page you have not published on Facebook yet, then after clicking Debug you'll get the relevant notification. Click the Fetch new information button. The information will be updated and new data will be displayed at the bottom of the page.