Route includes time travel to be on time for non-existent ferry

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When planning a route from Kandersteg, Switzerland to Milan, Italy it keeps suggesting to take a ferry from Kandersteg to Iselle. However, this ferry only goes on specific days and only at 5:00 and 20:00. And you have to book it a long time in advance. So I can't take this ferry.

The software both suggests an invalid ferry time but also tells me to travel back in time in order to make it to that time. Note the timestamps in the screenshot. It's not a day-rollover thing because the total trip time is not longer than 24 hours.

I don't want to select "avoid all ferries" because the proper ferry to take here is the one from Kandersteg to Goppenstein, which does go frequently.