Tafunge25 n the case you do miss your train, ask at the station office because you might need new seat reservations for the italian trains.
This connection is with a regional train in Italy, it means that the ticket cannot be used on an Eurocity with mandatory reservation, even in case of delay.
A new reservation is neither mandatory nor possible on the next regional train, but it is necessary to change the selected train with the link provided when you buy the ticket or in Trenitalia app after importing the ticket. This is not necessary for Arcobaleno Transfrontaliera tickets which are valid for 4 hours if you start your trip in Tessin.
However, I don’t know if these rules also apply with an international through-ticket if you miss a connection. It would be advisable to ask at the ticket office, as it is difficult to know if you really have a through-ticket or two separate contracts for Switzerland and Italy.