Notion has released Notion-Version 2022-06-28 with the following backwards incompatible changes:

• Set default Notion-Version to 2022-06-28 #298
• Page properties must be retrieved using the page properties endpoint. #258
• Parents are now always direct parents; a parent field has been added to block. #259
• Database relations have a type of single_property and dual_property. #260

Notion changelog: https://developers.notion.com/changelog/releasing-notion-version-2022-06-28