Sky Striker Mecha - Eagle booster not working

My opponent enters the End Phase,

I use the effect of Sky Striker Mecha - Eagle Booster targeting my Sky Striker Ace - Zero in the extra monster zone

On resolution of the chain, I used the effect of Sky Striker Ace - Zero to tribute herself for cost, to try and summon a Sky Striker Ace - Raye and a Sky Striker Ace - Roze and destroy a card on the field

My opponent chained an Ash Blossom & Joyous Spring, and it resolved negating my Sky Striker Ace - Zero that should have been immune to card effects for the turn

If the monster to which this effect is applied is no longer face-up in the Monster Zone, the effect will no longer be applied.

Not a bug