This time I used the first test (With the material for “User Innterface” → From original example provided by @3dRaven )
It started working after a few loops through the brackpionts.
I also put some delays in some places.
Then I removed the breakpoints and delays and now it never fails… it always works…
I think there is something loaded in memory that makes it work. (because it is exactly the same as when it didn’t work).
I also tried the other test, this time with an opaque material.
But for some reason that I don’t understand I can’t remove the widget from the viewport .
So I can’t see the Sphere and I don’t know if it’s working…
It only worked because of breaksponts and delays helped… for me it’s not a valid solution, it just helped something to load into memory. But on different computers it will take different times that’s why delays are not reliable.