New style boards (in "Business" type projects) should allow adding buttons for Connect apps
Allow connect apps to add custom menu items in Business Projects
Vendors are developing apps that want to decorate boards. They were able to add custom menu items to the "..." menu in the old-style Scrum and Kanban boards.
A vendor noticed that there is a new-generation board implementation coming. It appears in a "Business" type project they created. However, there were no available ways to add items there and no "..." as well