This only occurs on devices with touch input, use phone/tablet emulator in studio to reproduce
Visual aids:
Repro:
local StarterGui = game:GetService("StarterGui")
StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.PlayerList, false)
task.wait(5)
StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.PlayerList, true) -- visual glitch occurs
Expected behavior
There should be no visual glitch when re-enabling player list core gui