Web content loses its display page when deleting the default Asset Publisher from the page

Issue

• We have a Widget page with an Asset Publisher on it, which is set to be the default AP on that layout
• We also have a web content and our page is set as its display page in the web content's configuration
• When we delete the Asset Publisher, the web content gets updated and loses its display page

Environment

• Liferay DXP 7.0+

Resolution

• The behavior is intended, a DXP page can only be a display page if there is an Asset Publisher on it which is set to be the default Asset Publisher of that page
• If that Asset Publisher gets deleted, the page will lose its ability to be a display page and the web content will lose that configuration as well, because keeping the display page would cause further issues, as the web content would point to a page which can't display it.