The Next/Prev behavior has always been that way in Windows 10, and is outside of our control. It is something Microsoft have chosen to do for their own unfathomable reasons.
The Windows Photos app chooses to do things differently depending on how it is launched, and there's no other documented way to launch it that we are aware of, as with a lot of the "Metro" side of Windows.
See my reply here for more detail.
One of many reasons to avoid that style of application, as they tend to be very inflexible for use in any way but the ones Microsoft want you to use them. (Similarly, there is very little information about how to run the Photos app via the command line if you want it to do something more than just open a particular file. It is not a good photo viewer.)