Are there toilets on the buses to and from Nagano to Kamikochi (or at least frequent stops with access to bathrooms every <~10 min)?

We are planning on visiting Kamikochi in a couple weeks by taking the Alpico bus from Nagano/Matsumoto bus terminal. There seems to be inconsistent information on whether there are toilets onboard; some sources say that the reserved buses have restrooms while others state that none of the buses have them. The Alpico website says this under the information section: "8. This bus does not have a restroom onboard and there is no restroom break along the way." However we couldn't tell if that means all buses have no toilets or just specific ones. On the site, looks like the longest bus stretch is about 30 min. Has anyone taken this bus route recently and knows whether there are or aren't toilets available? Someone in our party has bladder issues so we're trying to plan ahead for frequent restroom access.

We are also planning on taking the bus out of Kamikochi to Takayama via Hiyayu Onsen, and are wondering if there are also toilets available on buses for the segment between Hiyayu Onsen and Takayama in particular. Thanks!