QTextEdit does not work with magnifier (using accessibility API)

It seems that the QTextEdit is not accessible using screen readers and magnifiers.
If the bug is confirmed, it is a critical problem for all the blind and visually impaired users.

The symptom with the screen readers:
If there is some text in the QTextEdit and the user navigates through the text using the arrow keys, the screen reader does not say anything.
Consequently, the user cannot edit the text because he has no idea where the cursor is.
(Screen readers used to test: NVDA, JAWS)

The symptom with the magnifier:
If the user writes a long sentence in a QTextEdit, the magnifier has to follow the cursor if it goes outside the field of view of the magnifier. But it doesn't do that.
Of course, during the test, the option 'follow the text insertion point' of the magnifier was turned on.
(Magnifiers used to test: Windows 10 magnifier, ZoomText)

Since I don't know solutions or workarounds, this is currently a showstopper for my project and I'm forced to use other libraries.

I'm avaible to run some tests and collaberate in order to solve the problem

Many thanks