HDR+ mode is gone

TL;DR: HDR+ mode is gone, except on stock factory image. Any solutions?

Guys, I really need some help with this one.
I love my 6P and it's camera, especially the HDR+ mode.

Until some time ago it worked fine but at some point, HDR+ jsut vanished from the camera. I tried out different ROMs but that that didn't solve the problem.
I flashed the factory image via fastboot and yes, HDR+ is back! :D

One problem, stock android doesn't have much features, so I flashed Pure Nexus.

And HDR+ is gone again... :(

I really can't figure this one out, and I'm at the point of giving up, I'm losing sleep and need my phone to be working before I go on vacation.

Can anyone help my with this one?
As far as I know I flashed everything correctly, and even started from scratch by flashing the factory image.

1. Flashed factory image with the flash-all.bat
2. Flashed TWRP 3.0.2.0
3. Reboot into recovery and Format Data to remove encryption
4. Mount in TWRP and place PureNexus, PureNexusGApps, and the MTC19V vendor.img
5. Flash the ROM, then Gapps, then Vendor to the vendor partition
6. Reboot system, rom boots up without problems, I set up me e-mail and fingerprint.
7. I open the camera app and HDR+ isn't there.

Anyone?

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