Filled map transparency

AllisonKennedy TomMartens i spotted the issue now. I unpacked the pbix file and checked the differences of the layout file and found that i use different designs. When i changed the Design on the solid file from "Standard" to "Classic" and BOOOOM. Thats it. Also some other designs work, some not. I could not spot a setting in the design to influence it, but this does not matter. If i have time i may look into the json for the designs to see what parameter influences it.

Thanks for you help, really appreciated - sometimes you overlook the obvious