Hello ,
I was able to reproduce this transparency issue on our end. I have written up a report (UE-22367) and I have submitted it to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. As for the other issue (UE-20777), I went ahead and double checked on this for you and the status has not been updated to fixed as of yet. Thank you for your time and information.
Make it a great day