Saw this issue on Reddit and looked into it.

Patch 3
Code
new entry "WPN_RC_UNIQUE_Axe"
type "Weapon"
using "_Axes"
data "ItemGroup" "EMPTY"
data "Act part" "9"
data "DamageBoost" "20"
data "CriticalChance" "10"
data "CleavePercentage" "25"
data "CleaveAngle" "150"
data "Value" "280"
data "StrengthBoost" "2"
data "ConstitutionBoost" "1"
data "SingleHanded" "1"
data "WaterSpecialist" "1"
data "ComboCategory" "Club,Hammer"
data "ExtraProperties" "FROZEN, 25, 1"
data "Boosts" "_Boost_Weapon_Damage_Water"
data "Unique" "1"


Patch 4
Code
new entry "WPN_RC_UNIQUE_Axe"
type "Weapon"
using "_RC_TwoHandedAxes"
data "ItemGroup" "EMPTY"
data "Act part" "9"
data "DamageBoost" "20"
data "CriticalChance" "10"
data "CleavePercentage" "25"
data "CleaveAngle" "150"
data "Value" "280"
data "StrengthBoost" "2"
data "ConstitutionBoost" "1"
data "SingleHanded" "1"
data "WaterSpecialist" "1"
data "ComboCategory" "Club,Hammer"
data "ExtraProperties" "FROZEN, 25, 1"
data "Boosts" "_Boost_Weapon_Damage_Water"
data "Unique" "1"

Patch 4 changed the using key, which transformed this one-handed axe into a two-handed axe. If this item was meant to be a two-handed axe, then:
  • SingleHanded: Key should be "TwoHanded"
  • ComboCategory: Value should be "TwoHandedAxe,CuttingTool"
Otherwise:
  • ComboCategory: Value should be "OneHandedAxe,CuttingTool"

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