Just a quick question about earth stance

From the release notes:

Monk earth stance should grant 0/6/12/20 Physical Resistance and 5%/10%/15%/20% AC.

And then:

Ultimate Mountain Stance Martial Arts Stance: The unyielding mountain focuses on endurance and defense. Ultimate Mountain Stance grants +4 Constitution, a 20% boost to AC, 15 physical resistance, a +70% Insight bonus to melee threat generation, and the critical multiplier of all weapons you use is increased by 1 on rolls of a natural 19 or 20, at the cost of -2 Dexterity and -10% movement speed. While in Ultimate Mountain Stance, you gain 'Get Hit Effect: Gain 1 ki.'

Now the question:

Which is it? 20 PRR or 15 PRR for earth stance IV? Thank you to whom so ever can answer this inquiry.

V