Same phone, same problem since the patch. I have a partial workaround if you want to add a new deck:
First open battle grounds, then open your collection in the battleground UI. This part of your collection won’t crash you. Now exit that and you should be able to open the regular “My Collection” without a crash because it will skip that opening animation that causes it (since it thinks you already had your collection open).
There are still other crash-causing animations that can trigger while turning pages so this works best if you just need to make small adjustments to a deck or add a new one via a code. At the very least, it will let you actually add new decks.
It’d be nice if Blizzard acknowledged this one and patched it. But I’m sure for now they’re still just handing out their standard “clear cache/reinstall/update Android” advice that I’m sure we all tried before coming here.