[lightspark]

Title says it all.

This snippet will allow you to reproduce this bug:

local frame = CreateFrame("Frame")
frame:RegisterEvent("NAME_PLATE_UNIT_ADDED")
 
frame:SetScript("OnEvent", function(_, event, unit)
    if event == "NAME_PLATE_UNIT_ADDED" and unit then
        local nameplate = C_NamePlate.GetNamePlateForUnit(unit)
        if not nameplate then return end
 
        if not nameplate.test then
            local test = CreateFrame("Frame", "Test"..nameplate:GetName(), nameplate)
            test:SetPoint("CENTER", nameplate, "CENTER", 0, 0)
            test:SetSize(64, 64)
            test:SetScale(UIParent:GetEffectiveScale())
            nameplate.test = test
 
            local child = CreateFrame("Frame", nil, test)
            child:SetSize(128, 12)
            child:SetPoint("TOP", test, "TOP", 0, 0)
            child:SetClipsChildren(true)
 
            local texture = child:CreateTexture("")
            texture:SetAllPoints()
            texture:SetColorTexture(0, 1, 1)
        end
    end
end)

Result looks like this:


If I set it to false, no flickering occurs.


If I parent test frame to, let's say, UIParent other frames start flickering, for instance, CharacterFrame or Minimap.

Obv, this bug is present on PTR too.