Quest mode: AI gets damage from tapped mana vaults with no mana vaults in play

[Goddfrey]

Describe the bug
At the beginning of it's turn AI sometimes out of nowhere starts getting damage instances from tapped Mana Vault(s) while having no Mana Vaults in play anywhere. Sometimes up to four instances at a time. My guess is the game checks for Mana Vaults in their libraries or hands.

Edit: happens to the player as well if they have Mana Vault(s) in deck.

To Reproduce
Quest mode, occurs randomly

Desktop (please complete the following information):

• OS: Windows 10
• Version 1.6.64 (according to help -> about) or v2 according to GUI :)