I have noticed this in a few of the games I have created. When you set the opacity lets say to 75% on a fake controller at the bottom of the game.
It shows 100% opacity and not the faint version of the button as it should at 75%.
It seems to be the same for all android devices I have tested it on. I tried setting both opacity on start of layout and in the properties menu but problem still persists when exported for android.
Its not a big deal but if anyone else is getting this problem then reply to this post and I will post it on the github bugs page.
I just need to know I am not the only one having this problem.