Hello AgusQui, 

Thanks for your message. We have taken another look at this intersection and we can confirm that there are bollards separating the east/west bound lanes. This is evident in this imagery: https://www.mapillary.com/app/?lat=-34.59322797089278&lng=-58.374696999581715&z=18.554141569166717&focus=photo&pKey=154817229855000 . This imagery is from 2017, but we (Kaart) have collected new imagery in the last couple of months and it shows the same bollards. This imagery will be viewable on Mapillary soon, currently its in ingestion portion of Mapillary's uploads. 
We will remap the intersection, following OSM best practices shortly. Thanks!

Huge_OSM_Fan