EVT_KILL_FOCUS triggered twice on macOS

wxpython 4.1.0, installed from pypi, Python 3.8

Code below sets up two text controls, side by side.
Focus starts in the first one, click in the second one.
EVT_KILL_FOCUS bound to a handler for the first one should trigger as you 
click on the second control and it takes focus from the first.

On Windows (7 and 10), it's only called once, as I'd expect.
On macOS 10.15.5: the editDone handler below is called *twice*.

Is this a bug? If so -- how do I tell if in wxPython or wxWidgets?
If not, what am I doing wrong? Suggestions appreciated!
thanks,
-ck

import logging
logging.basicConfig(level=logging.DEBUG)

import wx
import sys

logging.debug("python: %s", sys.version)
logging.debug("wx: %s", wx.__version__)

app = wx.App()
frame = wx.Frame(None)

sizer = wx.BoxSizer(wx.HORIZONTAL)
frame.SetSizer(sizer)

text = wx.TextCtrl(frame, style=wx.TE_MULTILINE)
text.SetValue("box 1 starts with focus")
sizer.Add(text, flag=wx.EXPAND, proportion=1)

text2 = wx.TextCtrl(frame, style=wx.TE_MULTILINE)
text2.SetValue("CLICK HERE to take the focus")
sizer.Add(text2, flag=wx.EXPAND, proportion=1)

def editDone(event):
    logging.debug("editdone: %s", text.GetValue())
    event.Skip()

text.Bind(wx.EVT_KILL_FOCUS, editDone)

frame.Show()
app.MainLoop()


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