wpf ComboBox RightToLeft error

Question

ComboBox not showing initial selected item when FlowDirection=RightToLeft

If ComboBox in start with LTR mode we have

And if switching to RTL in runtime we have

If ComboBox in start with RTL mode we have

And if switching to LTR in runtime we have

Answer 1

There is my demo which show show the data without the influence of LTR/RTL mode.
Here is the code:

It runs as below picture show:

This is my demo code for you to test.

Answer 2

you are right