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16-bit TIFFs from Apple Photos HEIF/HEIC images have huge artifacts in Affinity Photo

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I've done some controlled experiments and had another person verify this is repeatable.  Steps to produce the problem:

  1. Take photo with iPhone running iOS 11 (tested with iPhone 7 and iPhone X). Photo will be in HEIF/HEIC format
  2. Export image from Apple Photos on the Mac as an 8-bit TIFF
  3. Open 8-bit TIFF in Affinity Photo 1.5 or 1.6 (tested both) - image looks fine
  4. Export the same image form Apple Photos as a 16-bit TIFF
  5. Open 16-bit TIFF in Affinity Photo 1.5 or 1.6 and the right 10% of the image will be sort of a grey, metal-looking digital mess
  6. The same 16-bit TIFF looks fine in quick look and in Macphun's Aurora HDR 2018

 

Rather than clog up the system with giant files here's the 8 and 16-bit versions of the same photo in Dropbox so you can see for yourself:

 

8-bit:  https://www.dropbox.com/s/nityjdgibkfc9td/boogs 8-bit.tiff?dl=0

16-bit with mess on the right: https://www.dropbox.com/s/0t2kv4x2o7t0ft5/boogs16-bit.tiff?dl=0

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