I played a leyline binding against an opponent who had 2 non-land permanents in play. They had a treasure and buried in the garden. The leyline binding immediately picked the treasure without giving me a chance to choose the buried in the garden.

I believe that leyline binding is bugged when it comes to enchantments (possibly auras), but I don't have an easy way of testing this.

I ran the following post through google translate and it sounds like they have the same problem: https://feedback.wizards.com/forums/918667-mtg-arena-bugs-product-suggestions/suggestions/46838857-can-t-target-permanent-with-leyline-binding