I'm using Picamera 1.13 and have a UI made of overlays. According the documentation it should be possible to change the layer and alpha to hide and show overlays.
Changing the layer works perfectly fine, but setting alpha to 0 on the same overlay does nothing. It does seem to work fine if I try to make a minimal repro, which is strange. But in my app it stays visible. When I print the alpha value I can see it's 0, yet it's fully opaque.
Has anyone encountered a similar issue before or are there known issues related to setting alpha?