The Bug:

When a player performs any type of attack, that being a sweeping, weak, strong, knockback, or critical attack, the entity they harmed would normally receive some knockback, however, players can use shields to completely negate any incoming knockback that was inflicted by other players.

Due to the uprising of MC-223238, this had persuaded me to believe that this could potentially be an issue.

Steps to Reproduce:

1. Get two players and label them "Player A" and "Player B".
2. Have "Player A" switch into survival mode, obtain a shield, and begin blocking with it.
3. Get "Player B" to attack "Player A" with a knockback (sprint) attack.
4. Take note as to whether or not players receive any knockback when blocking other players' attacks using shields.

Observed Behavior:

Players don't receive any knockback when blocking other players' attacks using shields.

Expected Behavior:

Players would receive some knockback when blocking other players' attacks using shields.