In the weekly kde blog post by Nate Graham on 31st March 2023 it is stated this issue has been fixed and I haven’t seen anyone mentioning this issue afterwards.

If you don’t know, the issue is when a gtk app is maximized with its own title bar when you click the top right pixel on your screen it should trigger the most right button on there.

You can see the post I mentioned here

Is anyone still having this issue or am I alone?