Where did it go?

Xayah auto attacks disappear when they try to hit Gangplank's barrels. I'm not entirely sure whether its only when Xayah has a feather to shoot out with or just a normal aa.

1. Gangplank barrel is placed.
2. (This may not be needed) Xayah casts a spell and procs Xayah's passive.
3. Xayah auto attacks the barrel but deals no damage. Feather still drops, however. I've only had one game as Xayah vs Gangplank, but the severity of the bug makes it extremely noticeable while playing.

Second Link: https://youtu.be/1BNQJgeCopY