When I use Post Kind WordPress editor URLs with the ?kindurl= extension, I get an editor window that only has a title box and a response properties box but nothing else, and the response properties box only has the “response properties” title and no content. I first encountered this with Inoreader’s custom URL feature but found it also occurred when inputting the editor URL directly into my browser’s address bar. Here’s an example URL I might give Inoreader, where [URL] is Inoreader’s URL variable: example.com/wp-admin/post-new.php?kindurl=%5BURL%5D&kind=reply
If I do it with just kind=reply without trying to use kindurl=, it’s a normal editor with reply selected as the post kind and a blank response properties box as you’d expect.

WordPress post editor only displaying title box and empty response properties box