Completely overlapping wind charges will separate when colliding with blocks at high speed.
However, logically, the Wind Arrows should explode simultaneously, not one after another, and change the flight state.
This should be a bug, because when the wind arrow collides with blocks at low speed, it will explode simultaneously, which is completely different from the situation when it is flying at high speed.
Causing some redstone machines to malfunction
I've only noticed this when the wind charges are going down and collide with a block. I suspect the issue is caused by a wind charge exploding and cancelling thr momentum of all other wind charges, causing them to fail thr collision check.