Opening Decks And Interacting with WayPoint Caused all the Cards to be Deleted

I was opening Decks with a controller and dropping the cards on the ground. I use this method because while I normally play with a keyboard and mouse this is much less taxing on my wrists, and dropping them on the ground is the only way to get my loot filter to apply to cards to eliminate the 90%+ of cards which are useless.

I chose the Azurite Mines to do with and opened ~400 decks. I was in the process of picking them up when spam pushing A to loot them caused me to interact with the WP and go to the Act 1 town, since that seems the default for the Controller WP. I want to make an aside here for loot filters and controllers. The loot filter label item location disconnect is so much worse with a controller and is what lead to the WP miss-interaction. When the filter icon and the actual item are too far apart it simply cannot be looted, and as far as I can tell there isn't a way to reset the loot filter the way there is with a keyboard. What I've been doing is changing zones...I guess I'll have to find a new strategy for that

I immediately returned to the Azurite Mine, to find that the instance had reset in the 5 seconds I was gone and all of my cards were gone.

My lesson from this is that I should only use large layouts like the Menagerie or Aspirants Plaza...My personal lessons not withstanding...This is pretty enraging. The experience for opening decks is miserable, the experience of looting cards with a controller is miserable, the experience of turning in cards (in volume) is miserable...but being able to accidentally WP out so that all my work was deleted due to how bad the item filter controller looting interaction is...that's unacceptable.

I'm not sure if you'll even consider this a real bug...but honestly I don't think the behavior is justifiable if it is intended.