Avelyne , The Withered Rose vs Poisonburst Arrow

The bone cage ability creates a... bone cage.

So I'm fighting and doing just fine, get locked in a bone cage, attack, attack, attack... cant get out, no way to get out... what is going on.

Well, im guessing because poisonburst arrow doesnt hit... and that interaction makes it so the bone cage is "immune" to my main attack... seems weird.

I guess this isn't really a bug but maybe a... was this really intended? Should I have somehow known that I couldn't DPS bone cage with poisonburst arrrow before I started the fight?

Taking the full damage of her chaos fire beam while stressing about why in the world my damage isn't allowing me to leave the ring is... pretty bad feeling.