When the phantoms are size 0, they deal only 2 damage, when they are size 1, they deals 6 damage like 1.13 and Bedrock.

The bug

When the phantoms are size 0, they deal only 2 damage, when they are size 1, they deals 6 damage.

How to reproduce

1. Summon a phantom with spawn egg
2. Let it attacking player

It deals 2 damage.

1. Summoning a phantom with size 1
2. /summon phantom ~ ~ ~ {Size:1}

It deals 6 damage.