I have noticed this behavior sometimes on Audi Q2 which is 4 years old so definitely this is an issue with all VAG products and don't think there would be a proper solution for this soon.There's no standard cruise, there's ACC only. Adjusting speed to signs can be switched on or off in options.
What we discussed here earlier, is that sometimes car thinks it's in Europe, and discovers the cars driving slower on left side and slows down Formentor, to avoid undertaking. I confirmed, that car does it on certain part of M25, checked it 2 days ago. Somewhere between J12 and J9.