In this new hard difficulty mobs has changed.
Mobs will always have this difficulty changes:

Zombie/Husk:
- Full iron armor Protection 3
- Iron sword Sharpness 2
- Fire resistance
Skeleton/Stray:
- Full diamond armor Protection 1
- Bow Punch 2
- Second hand with Totem of undying
- Fire resistance
Creeper:
- Is powered
- Invisibility
Spider/Cave spider:
- Speed 2 Strength 2 Resistance 2
Enderman:
- Strength 4 Invisibility
Drowned:
- Trident
- Golden boots Protection 2 Depth strider 3
Villager:
- Posion 5
Iron Golem:
- Strength 3 Speeed 2 Resistance 2 Regeneration
Bee:
- Resistance 2 Strength 2
Zombified piglin:
- Resistance 1 Speed 1
Piglin:
- Full golden armor Protection 2 Thorns 3
- Crossbow quick charge 2 Multishot
Piglin brute:
- Diamond axe Sharpness 2
Pillager:
- Crossbow Quick charge 2 MultiShot
- Second hand with Spectral arrow
Vindicator:
- Speed 2 Diamond axe
Evoker:
- Resistance 2
Vex:
- Diamond sword
Ravager:
- Resistance 2
Witch:
- Regeneration 2
Slime/Magma cube:
- Resistance 2 Strength 1
Wither skeleton:
- Netherite leggins Protection 2
- Netherite boots Soul speed 2
Ghast:
- Speed 2 Resistance 2
Hoglin/Zoglin:
- Fire resistance Speed 2
Phantom:
- Speed 2 Fire resistance
Silverfish/endermite:
- Strength 4
Shulker:
- When shulker dies or shulker bullets impacts spawns a tnt
- If shulker bullet hits you will be apllied blidness
Guardian:
- Speed 1 Resistance 2
Elder Guardian:
- When dies spawn 3 drowneds and 1 guardian
Wither:
- Strength 1
Dragon:
- Resistance 3 Speed 1

When player break any block receives damage
Drown will cause more damage to player
Touch lava will cause more damage to player

Good luck, have fun, and challenge your hability