Sorry, I didn't specify that. I had enabled routing for Live updates in Development Settings. But still, the "turn:lanes" property I added is not visible when I drive through that intersection. So I wonder whether these properties are included in the Live updates, or not. (Or, more generally, what is and what is not included in Live updates, so that I don't need to ask this question again for a different property in the future).
So, over the weekend I drove through the route I improved last week and it showed none of the turn:lanes improvements I did (as far as I can remember). So at least in my case, it seems that turn:lanes are not part of Live updates at all.