Check the province effects in bottom left corner. All 3 Italia citys are "Heavily Urban Regions" which gives the following effect: -4 food per fertility level. Gotta put that in your calculation. Your screenshot even says -16 food from fertility (3 citys x -4 food for fertility x 8 fertility = -96 + 80 from the farms fertility = -16).
And yes iam 100% certain Public Wells don't give sanitation to the whole region. You are probably being fooled by the province effect again. Some regions get a sanitation bonus (the rural regions) while urban cities get a squalor penalty.
Check my screenshot: Caralis has 4 Sanitation (1 from govenor, 2 base, 1 because its communal) while Ajax has 7 (2 base, 1 govenor, 4 from the public well).
To sum it up for those that have to read it:
1. Food of course still works as intented. Although granaries give the +60 food during all seasons (not sure if intended)
2. Governors now give the sanitation bonus (iam 95% sure they didn't yesterday)
3. Public wells either don't work as intended or have a wrong description (they only give sanitation to the region they are in not whole province)