All swords have the same mining speed

Summary:
All swords have the same mining speed when mining cobwebs.

Steps to reproduce:

1. Place some cobwebs.
2. Obtain all types of swords.
3. Mine cobwebs with all of the swords.
4. Compare the breaking speeds.

Observed results:
All swords have the same mining speed.

Expected results:
Swords should have different mining speeds depending on the tier.

Video:
mining_cobwebs_with_swords_.mp4