[Gilsuk]

local GetNamePlateForUnit = C_NamePlate.GetNamePlateForUnit
local previousTarget
 
local function OnTargetChanged()
    local parent = GetNamePlateForUnit('target')
    local currentTarget = parent and parent.unitFrame
 
    if currentTarget == previousTarget then return end
 
    if previousTarget then
        previousTarget:SetBackdropBorderColor(0, 0, 0)
        previousTarget = nil
    end
 
    if currentTarget then
        currentTarget:SetBackdropBorderColor(1, 1, 1)
        previousTarget = currentTarget
    end
end
 
oUF:SpawnNamePlates('MyStyle', OnTargetChanged)

I use this code above and don't have any issues