Can't cast Adventure spells using Bilbo, Thief in the Night attack trigger

Forge doesn't let you cast an Adventure instant or sorcery spell from your graveyard as `Bilbo, Thief in the Night`'s triggered ability resolves.

### Card
[**Bilbo, Thief in the Night** ](https://scryfall.com/card/hob/33/bilbo-thief-in-the-night)
{1}{U} — Legendary Creature — Halfling Rogue

Spells you cast from anywhere other than your hand cost {1} less to cast.

Whenever Bilbo attacks, you may cast an artifact, instant, or sorcery spell from your graveyard. If an instant or sorcery spell cast this way would be put into your graveyard, exile it instead.

2/2

### Observed problem
When attacking with Bilbo, if there are cards with Adventure (e.g. [Picklock Prankster // Free the Fae](https://scryfall.com/card/woe/64/picklock-prankster-free-the-fae)) in the graveyard, Forge won't let you select them to cast the instant/sorcery side. The rulings explicitly says that this is allowed.

### Reproduction

Environment:

- Forge: 2.0.15-SNAPSHOT
- Mode: Duel with an AI
- Use a deck containing `Bilbo, Thief in the Night` and any card with an Adventure
- Put a card with an Adventure in the graveyard and attack with Bilbo.

Observed behavior:

- The card(s) with an Adventure cannot be selected with Bilbo's attack trigger

### Expected behavior

Forge should allow casting the Adventure instant or sorcery spell (but shouldn't allow casting a creature spell on the same card)