Hi CiriCuervo,
this changeset has destroyed the boundary relations of "Ceramista" and "Villa Mitre":

https://tools.geofabrik.de/osmi/?view=areas&lon=-59.87018&lat=-36.76466&zoom=16&baselayer=Geofabrik%20Standard&overlays=duplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways%2Cduplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways

https://overpass-api.de/achavi/?changeset=152356101

https://www.openstreetmap.org/relation/17322990/history

Especially the deletion of way 820788001 has caused this errors:

https://www.openstreetmap.org/way/820788001

I have just fixed this. Please be careful editing relations.
Guido