Link preview can break in WhatsApp Web due to any number of reasons, including a change in the link’s underlying HTML or an issue with the way WhatsApp Web interprets the code of the linked website. This can cause the link to not show its preview at all, or to produce a broken version of it. It can also happen when there is an error between the way WhatsApp Web handles certain types of links and the content of the website. In some cases, the link may be outdated, meaning that the content of the website has changed since the link was last used.