2.99 API for adding to the local Layers menu is broken
As reported here, adding a plug-in to the Layers dialog menu doesn't work.
e.g. the following is supposed to add a menu item "Run Layer Tests" to the Layers Dialog Menu.
procedure.set_menu_label("Run Layer Tests")
procedure.add_menu_path('<Layers>/Layers Menu/')
This is due to a change in the parameters, while the check was not updated.
Note that we probably have the same issue with at least <Channels>
and probably most other local menus too (to be checked).