Also experienced this bug. If all the cards in your graveyard are creatures, they all go into the fake hand zone and can not be used for foraging. If you have at least one non-creature, you still have a visible graveyard and can click to open it to forage as normal. This cost me a game today where I lost a full turn cycle with a tapped adept and not spending any mana since the UI failed to let me use the adept.
Also experienced this bug. If all the cards in your graveyard are creatures, they all go into the fake hand zone and can not be used for foraging. If you have at least one non-creature, you still have a visible graveyard and can click to open it to forage as normal. This cost me a game today where I lost a full turn cycle with a tapped adept and not spending any mana since the UI failed to let me use the adept.