Screen readers not reading field labels in wx python 4.0.4

I’m new to WX Python.
I am totally blind, and use screen reading software. When building a GUI form with WX Python 4.0.4, I notice that screen readers aren’t reading the labels of my text control fields.
If I install one of the 4.1.0-dev builds, things work fine. Is there something I need to do to get 4.0.4 to read the labels the same way they are working in 4.1.0?
Version 4.0.4 was installed via pip.

I’m not aware of anything specific that would cause that kind of change between 4.0.x and 4.1.x, so it’s probably due to changes in the underlying wxWidgets library. If so, then there isn’t any way to get it working in 4.0.4.