Map Chart: Italy Regions not displaying properly

I created a map chart containing the values of the Italian Regions (1st level administrative divisions).
The chart was working fine for a few months, but starting a few days ago, the data is no longer displayed correctly: after creating the map chart, the regions are overlapped (Albers map projection?), but even when setting Mercatore projection, several regions are missing (here highlighted in yellow).

This issue occurs both with the names of the Regions in Italian and with the same names in English.
I saw that it's possible to create a map chart with Province data (2nd level administrative divisions), but I don't want to create a chart with detailed Province data, I want to use Regions data.
I'm using Office 365 64-bit, version 2403.
Any idea? Thanks.