Fireworks physics are extremely buggy to an absurd degree. When contacting any block, they begin to slide across the floor and clip through blocks, this bug, in turn, leads to another, as when they clip into blocks their explosion damage is nullified, causing the feature of loading fireworks into crossbows to become utterly useless without a perfect distance from the mob you wish to shoot.

When firing into tight spaces or near the corner between two blocks, the fireworks may entirely clip through the wall and fly off in a random direction, and it is nearly impossible to fire a firework through a 1x1 gap.

To recreate, simply load a firework into a dispenser or crossbow and fire it. The bug is consistent across every version and does not require a special process to cause it.