Sivir Spell Sheild Bug

I dont know if this is intentional or if it has always worked this way, But I i have never seen Sivirs spell shield block multiple abilities. but my last game it was blocking to abilities if they overlapped during the "fizzling" of the shield animation. Examples: I flayed her, as thresh, as her shield was up. Then my Vayne condemns her as the shield is "fizzling" away and it blocked the condemn as well as the flay. Our Jax jumps on her and uses e, she shields then E goes off proc'ing her shield. Morgana follows up with a bind as the shields animation is "fizzling" and it blocks Morgana q and jax e.