PySide6 tutorial application does not have shadow on Wayland on Ubuntu

[rs___]

I'm using Ubuntu 22.04.3 and when I try to create deskstop applications with PySide6, such as the example app here, I do not see a shadow around the application as I do with other windows, which makes it hard to distinguish the QT application from other applications around it. I noticed that other QT apps, such as Okular, do not have this problem. Is there something I can do to fix this? Here is a screenshot showing what I mean:

[jsulm]

@rs___ If you start that application from terminal: do you see any warnings or errors?

[rs___]

@jsulm Nope, nothing.