Tripwire don't work underneath with projectiles

Basically, when you throw a snowball underneath a tripwire, it doesn't activate.

What I expected to happen was...:
In previous versions, it should activate and there will be an redstone input.

What actually happened was...:
Now, when I do it, it doesn't work. The tripwire doesn't get activated

Steps to Reproduce:
1.  Place 2 dirt blocks, 3 blocks apart and build 2 blocks on them to make them 3 blocks high.
2.  Place a tripwire on each of the the highest block facing each other (should take 2 tripwire)
3.  Place a string in the middle to make it a redstone contraption.

4. Throw a projectile onto the string under it (should work in other versions)

5. Not working