Projectiles Hit Scaffolding, Then Fall Through

When projectiles such as tridents and arrows hit scaffolding, they stop, then fall through.

Steps to Reproduce

1. Download and open the attached world
2. Press the button on the dispenser

Observed Result

The projectile hits the scaffolding, causing it to stop, then the projectile falls through the scaffolding

Expected Result

The projectile hits the scaffolding, causing it to stop.