Weather seems plausible. The inbound flight FR4189 attempted to land at BGY but ended up diverting to MXP. The aircraft remained at MXP for a few hours and then flew to BGY early in the morning.
Here are the METAR weather observations at BGY (LIME) from just before the flights scheduled arrival until the end of the day:
ARCHIVED METAR OF: 20230420 // FROM: 20 TO: 23 UTC
AIRPORTS REQUESTED: LIME
LIME 202020Z 26019KT 5000 SHRA VCTS SCT008CB BKN025 10/08 Q1012 TEMPO 4000 TSRA
LIME 202050Z 27008KT 250V330 4000 SHRA VCTS SCT008CB BKN025 BKN040 09/09 Q1013 WS RWY28 NOSIG
LIME 202120Z 34005KT 5000 SHRA SCT010CB BKN030 09/08 Q1013 WS RWY28 NOSIG
LIME 202150Z 03003KT 360V060 7000 -RA FEW010CB BKN030 10/09 Q1013 RERA NOSIG
LIME 202220Z 04004KT 010V070 7000 RA FEW010TCU BKN030 10/09 Q1013 NOSIG
LIME 202250Z VRB02KT 7000 -RA SCT010 BKN035 10/09 Q1013 NOSIG
LIME 202320Z 03005KT 7000 -RA FEW010 BKN030 10/09 Q1013 NOSIG
LIME 202350Z 36003KT 260V040 8000 BKN030 10/10 Q1013 NOSIG
It looks like thunderstorms were the culprit.