Hi, and welcome to Italy.

Whatever 'better', you bricked the 2 water area outline relation so now blue has turned white. The editor you use is very good at that, breaking multipolygon relations. I'm sure an experienced mapper will fix it today, but so you're aware on your next mapping endeavor.

Ciao

PS ESRI Clarity imagery is very dated in this region. Better use ESRI or Bing as background.

See before it's fixed https://tools.geofabrik.de/osmi/?view=areas&lon=12.43761&lat=45.44200&zoom=14&baselayer=Geofabrik%20Standard&opacity=0.50&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