It’s the same for me. If I take a picture of a person in night mode, it no longer saves the depth data and I can’t convert it to a portrait afterwards. And if I’m in portrait mode, night mode will not activate no matter how dark it is. I don’t think it’s a bug, I think Apple just flat out removed the ability to take night mode portraits and didn’t actually announce it. Check this link: Take Night mode photos with your iPhone camera – Apple Support (UK)
If you select the link for “supported devices” for taking night mode portraits, it lists the 12 Pro to the 16 Pro, but *not* the 17 Pros. But if you click for supported devices for other features (night time selfies for example) it does list the 17 series, so it’s not just that the page hasn’t been updated yet with the 17 series phones.
I can’t see any reason why this would be the case. The 17 Pro has all the same main sensor and LiDAR Scanner as the 16 Pro, so it’s not a hardware issue. I could take night mode portraits on my 16 Pro, , so it’s not a software issue. They just decided to remove a feature that you had before, and not say anything about it. Which is a shame because some of my favorite pictures have been night mode portraits (pictures of my wife when out do a dinner date in a dimly lit restaurant, my kids outside at night surrounded by Christmas lights, etc).
I hope they restore the functionality. Or at least acknowledge that they took it away.
[Edited by Moderator]