If you undo after playing Harbinger, you cannot select which card to topdeck.

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Dwedit

Step 1: Play Harbinger
Step 2: Pick a card to topdeck
Step 3: Undo
Step 4: The UI to select which card to topdeck is missing.

santamonica811

If you give the game number, it will be much easier for people to investigate and for them to attempt to replicate.

markus

That bug is known. Unfortunately, you have to ask your opponent to undo also playing Harbinger and play it again.