The knockback on shields doesn't affect enemies like it should. In 1.13, mobs that attacked the player while shielding where pushed back a short distance. This doesn't happen anymore in the 1.14 snapshots.
MC-148456
Shield knockback isn't working
Resolved
Duplicate
0
Coslento
(Unassigned)
Unconfirmed
(Unassigned)
Minecraft 1.14 Pre-Release 2, Minecraft 1.14 Pre-Release 3
Retrieved
Kind of a duplicate of MC-147694