Single record view involving object with many-to-many relationship to pagetype object.
1) The grid view for pagetype object. Adding @siteTreeGridFields to pagetype object doesn't help. You will have to add @datamanagerGridFields in the pagetype object. However using fields outside of the pagetype object such as title/slug/parent_page will throw a JSON error and will not display any related pagetype record.
2) The field labels for the pagetype object. You will need to create another properties file under the preside-objects folder as it doesn't read the one in page-types folder. However, it wasn't able to read the title field. If the field label does not display well, you will need to add it into the pagetype's properties.