When you attack an enemie with a sword and other enemies are nearby enough, they should also get hit. This works correctly.

Also when you land a critical hit, the other nearby enemies are not hit. This also works correctly.

The issue is attacking while sprinting. In this case nearby enemies don't get damage, even though they should. This is not a critical hit.

The attached video shows all three of the above in 1.15.2. The zombies are too far away (from the player?) at the first attack in the video to be hit. This issue is not about this first attack.