Currently I am receiving the error message that the "Three of Swords" and "Four of Swords" cannot be placed into the "Pack of Endless Pockets" 32slot inscription bag.
This seems odd because the cards of the Rogues Deck can be placed into this bag no problem.

I have not been able to test with smaller inscription bags or with higher level decks (my scribe is low level)

I'll update this if I can get any additional information.

This is a known issue. Thanks.

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Maaven
Blizzard QA