Not sure where to report this and where this bug might happen.
If I'm viewing a file which has multiple classes and a split my emacs frame into two side-by-side (C-x 3) windows and view class A, method a in the left window and class B method b in the right window, both windows will show module_foo.py > A > a when I'm in the left buffer and will show module_foo.py > B > b when the cursor is in the right buffer, after a short delay.
If you can't reproduce this, what information would you need?