Hello Leonardo Capitani
In June, there are construction works planned by Trenitalia near Milan. Some Eurocity trains are rerouted or replaced by buses.
Currently, there is no information about the EC30 available. Trenitalia is responsible for the timetable changes. It seems not all information has been provided yet.
You have got a valid ticket. Trenitalia has to get you to Bologna somehow.
You can ask SBB about the current status: +41 51 225 78 56 (24/7).
Kind regards,
Roland