Weld Constraint & Motor6D Issue

Hello there.
While making an Accessory System similar to Royale High one, I encountered an issue that I never faced before: Motor6D and Weld Constraint are not able to overwrite the Part1 property(not because the part1 doesn’t exist).
This is the code that a week ago worked but now it suddenly doesn’t:

function AccessoryService:CreateWeld(parent, part0, part1)
    local weld = Instance.new("WeldConstraint")
    weld.Part0 = part0
    weld.Part1 = part1
    weld.Parent = parent
end

function AccessoryService:Create6D(parent,part0, part1)
    local motor6D = Instance.new("Motor6D")
    motor6D.Part0 = part0
    motor6D.Part1 = part1
    motor6D.Parent = parent
end

function AccessoryService:Weld(parent, part0, part1)
    self:CreateWeld(parent, part0, part1)
    self:Create6D(parent, part0, part1)
end

function AccessoryService:PreFabAccessory(plr: Player, accessoryProfile)
    if not accessoryProfile then warn(string.format(ACCESSORY_PROFILE_NIL, accessoryProfile.Attributes.AccessoryId or "*not specified*")) return end
    local char = plr.Character
    local accClone = accessoryProfile.Instance:Clone()
    
    local primaryPart = accClone.PrimaryPart
    local attachType = accessoryProfile.Attributes.AttachType
    local partToAttachTo = char:FindFirstChild(accessoryProfile.Attributes.PartToAttachTo)
    
    if attachType then
        --Applicate specific attachment type
        print(attachType)
    else
        accClone:PivotTo(partToAttachTo.CFrame)
        self:Weld(primaryPart, primaryPart, partToAttachTo)
    end
    
    accClone.Parent = char
    print("Pre-fab Stage")
    return accClone
end
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