If you select multiple cards and toggle suspend, it will toggle all the cards based on he state of the last selected card. So if the last selected card is suspended, selected cards that were all ready suspended will remain suspended non suspended cards will be suspended.
However, if the group of selected cards contains buried cards, and the last selected card is suspended, unsuspending the group of cards will also unbury all the cards. Toggling suspend should not also toggle bury.
To recreate error:
Select 3 cards in this order: an unsuspended, a buried, and a suspended. Then press the suspend toggle shortcut. Notice the suspended card is now unsuspended, but the buried card is also unburied