If a models default view is timeline (from OCA/web/web_timeline) then the icon in the main menu doesn't works for it.
In order to reproduce it just take one OCA module with timelines (like fieldservice) or project_timeline and changes the action associated to the main menu to one timeline view.
Here is one video of the issue. Note that at the end I mean "No problem with the tree view", but I did mean "No problem with the kanban view".
This might happen for 13.0 also.
If a models default view is timeline (from OCA/web/web_timeline) then the icon in the main menu doesn't works for it.
In order to reproduce it just take one OCA module with timelines (like fieldservice) or project_timeline and changes the action associated to the main menu to one timeline view.
Here is one video of the issue. Note that at the end I mean "No problem with the tree view", but I did mean "No problem with the kanban view".