[BUG] Assign PopupPopular or Menu to TAB shortcut does not work

I would like to customize TAB shorcut instead of SUBD, when I use PopupMenu or PopupPopular, the command is loaded, and dynamic help is updated, but no menu appears…

It works with any other command well, but not popup…

Popup works great with any other Keyboard direct, like F1…

Thanks for your help

EDIT: when pressing TAB sometimes, a small glitch makes apearing the popupmenu few miliseconds, and immediatly disappearing…