This bus is in the planner. It runs from "Tirano Stazione Bus” to Lugano

Also remember you can always add trains and buses manually.

@Nanja, "Tirano Stazione Bus” should be grouped with Tirano just like "Lugano, Stazione Nord” (the Lugano stop of this bus) is grouped with Lugano.

Thanks so much! This solved the issue.

@Nanja 

This info should be maybe be displayed on the Eurail site somewhere. This traveller is not the only one getting the paper pass stuck in the US customs.

https://community.eurail.com/eurail-interrail-passes-41/united-states-delivery-of-eurail-paper-pass-7430

I've informed the relevant team about it. Cheers, 

Update: according to our reservation team, Eurail, doesn't group any stations. This is done in Merits and information comes from carriers. Now, as for Lugano it is grouped with other stations (how SBB provided), Tirano is not. So if this station to be grouped together, it would have to be changed in Merits.