use dual camera on Meizu 16th

Sorry, I do not know exactly where to ask this. I am at Meizu 16th and with the Rom of May 12th I can use both cameras, (only with camera app open camera). With later roms this is not possible anymore you can only use the 12 megapixel camera not the 20 megapixel. What is the problem? Is there a solution for newer updates and the both …