Full screen preview color space different than thumbnail

The full screen preview color of an image is different than the thumbnail of the same image. The images is a PSD in adobe RGB color space 16 bit.

There's something whacky going on with the color profile where the thumbnails and full screen previews look different. The thumbnails look correct, but the full screen preview looks desaturated.

In the attached, the thumbnail (correct color) is the left image. You can see there is quite a difference.