Hi,
this changeset has created quite a mess regarding self intersecting ways:
https://tools.geofabrik.de/osmi/?view=geometry&lon=-58.56772&lat=-34.66108&zoom=13&baselayer=Geofabrik%20Standard&overlays=self_intersection_ways%2Cself_intersection_points%2Csingle_node_in_way%2Cduplicate_node_in_way

https://overpass-api.de/achavi/?changeset=138009717

I have reverted it to fix those issues.
Guido