.html and edit not working

Hi I make a premalink structure for my BBpress: https://www.screencast.com/t/PGMNgCQh8i .

But when user need edit the post https://domain.name/forums/post.html/edit doesn’t opening, so I need manually change url to https://domain.name/forums/post/edit and now I may edit. May you help me solve that issue?