Flip image horizontally and vertically

DxO PhotoLab Feature requests
7

I just had a play with Exif Editor on my Mac, flipping a copy of an image horizontally in the EXIF data.

29

In Finder, I get (original on left, flipped on right) :

17
17778×546 405 KB

However, in PL3.2, I get (flipped on left, original on right) :

41
41715×328 57.5 KB

I thought I had stumbled across a kludge until this is properly implemented in DxO but, it would seem DxO is doing something inconsistent behind the scenes.
Any ideas?