Guild Wars 2

Starting in Legendary Dwarf Stance, using the elite skill (Rite of the Great Dwarf) and then immediately switching to Legendary Demon Stance re-fills the “profession-specific energy” bar to 50%.

Is this intentional?

Yes, as I recall from Revenant discussions by devs, the swap puts you at 50% no matter what percent you began at. It’s part of the moment to moment tactics.

^ what donari said.