Part of this is a moot point. Everyone can Hide or Disengage (Jump) as a bonus action. But Astarion could not Dash (he's 2nd level) as a bonus action, but he could still Jump, Hide, ect. Shows up on his character sheet, but couldn't use it after an attack. Bug maybe?
Astarion's bonus action Dash appears in the right (of of his profile picture) window, where usable items/specific abilities go. It does Not change the Dash icon in the left window where all the standard actions/bonus actions are. Thus, you can use Dash as a regular action and/or as Astarion's rogue bonus action.
