Here is the update on this topic. I went to Skoda official dealer and they were really attentive. After they connected my Octavia to VCDS they said by the Software they got from Skoda they do not have option to turn those lights. But they "unofficially" told me it is possible that lights could be turned on in some other work shop with VCDS which does not have that "official" Skoda software, but I should avoid doing it until my guaranty period. They noticed wieres, but Skoda dealer did not want to disassemble the rear light in order to check if there really exist LED bulb in the boot.
If someone have some other positive experience I would please share. This really annoy me.
And @Matmacka could you please shere photo of your rear light. Just to check is it the same as mine.