There are other people reporting this as well in the Lightroom forum. As I don't use Photoshop, I don't know if a solution has been found. I suggest you search in the Lightroom forum.
There is no need to go to the Camera Raw interface. Lightroom has all the same exact controls as Camera Raw does. When Lightroom sends an image to Photoshop, Camera Raw is simply used to interpret the Lightroom adjustments. The image is interpreted and then sent directly to Photoshop. If you want access to the Camera Raw interface you will have to open your images as smart objects and then go to Camera Raw from Photoshop.
Added later: the workflow I described is what happens when you use the "Edit in Photoshop" option. You are talking about "exporting" to Photoshop. How are you exporting?