Same problem here with Maps/Mojave 10.14 (not BETA).
Photos/Auto Enhance produces a black image as a result.
Any solution ?
Host High Sierra 10.13.3, Parallels Lite 1.3.3
The graphics adapter must support "Metal", like this:
Radeon Pro 560
Metal: Supported, Funktionsset macOS GPUFamily2 v1
Radeon 630
Metal: Supported, Funktionsset macOS GPUFamily2 v1