Particles are slowed down by Cobwebs

What I expected to happen was...:
To have a nice indoors fireworks show

What actually happened was...:
The fireworks particles got stuck in cobwebs... Are they entities?

Steps to Reproduce:
1. Launch a rocket
2. Detonates next to cobweb
3. ???????
4. Particles!

Also affected particles:

• mining blocks
• smoke
• water drips