TopicHeader (Text Above Title) Not Updating in SharePoint Online

Previously, I was updating the "OData_TopicHeader" property in Power Automate, and it correctly displayed as the Topic Header (text above the title) on the page.

However, although the property is still being updated successfully, it no longer appears on the page as expected.

Has anyone else experienced this issue, or is there an updated approach required to ensure the Topic Header displays correctly?