Cannot plan a route using Harwich -> Hook of Holland Ferry

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I'm trying to plan a route from London to Amsterdam, via the ferry from Harwich to Hook of Holland. ABRP wants to send me via the Eurotunnel, and even if I add waypoints at Harwich International Port and Hook of Holland, ABRP simply routes me to Harwich, then back to the Eurotunnel, then to Hook of Holland and finally to Amsterdam.

ABRP is smart enough to recognise a non-driving segment of my route (such as the Eurotunnel train), so not sure why it doesn't understand a non-driving segment like a ferry.

I reported a bug at 18:50 on 12/10/22.