Please add your me-too vote to this bug report in the official Adobe feedback forum, making it a littlle more likely Adobe might prioritize a fix: Lightroom 6.7: Opening photos in Photoshop from Lightroom using Edit In does not work correctly for some operations | Ph… That bug report also contains another workaround.
Thanks for the link John - done.
There is another option. Either first or after you select Edit In > Open As Layers select Edit In > PS version you are running. With that PS will open and then your images that you selected to open as layers will be loaded. Close the first image without saving.