Ability to flashback a card from opponent's graveyard

[LucasTheDrgn]

Describe the bug
During a duel in adventure mode, I was able to cast my opponent's cards with flashback from their graveyard

To Reproduce
Steps to reproduce the behavior:

1. Enter a combat in adventure mode
2. Load the attached game state
3. Open the opponent's graveyard view
4. Click on Geistflame
5. Observe the ability to select a target, put the spell on the stack, and haven it resolve and go to the opponent's exile

Expected behavior
Clicking on a card in an opponent's graveyard, even if it has flashback, should not allow the player to cast it, but rather inspect it instead like any other card that is unable to be played.

Screenshots

state0.txt

Desktop (please complete the following information):

• OS: Windows
• Version v.2.0.14-SNAPSHOT-07.20

Additional context
I was able to reproduce it with loading this game state, but haven't yet run into another opponent with flashback cards to attempt to reproduce it in another case entirely.