Shower cold shot not working on Nefit Trendline II

[proddy]

As reported by bastb on Discord, the cold shot is not working on the latest Trendline II boiler. I recently installed the same boiler and can confirm this. I'm 100% sure it worked on the Trendline I and older models.

When called, the boiler enters the Function mode correctly (with the flashing T), but setting the 3-way value to turn off DHW does nothing in the function boiler::set_tapwarmwater_activated() . There are no errors.