Let me quote something from the very topic you are referring to
RiXeN wrote:the stripe is the DRL, and parking light, it should stay on with the position light, however, it's not possible due to limitations with the current lightmask system (The main lights, and where you have to map the DRL are not on the same uv grid, it's one, or the other. Just like how you cannot have something masked as an orange parking lamp and a turn signal at the same time).
Is it clear now?