TextCtrl EVT_SET_FOCUS on Windows loses cursor

wxpython 4.1.0, installed from pypi, Python 3.8
On Windows (win7, and win 10) If I bind *anything* to TextCtrl 
EVT_SET_FOCUS, I lose the insert cursor. 
I can still type, but never see a cursor.
On MacOS, multiple versions, it's fine: I always see the cursor.

Is this an issue with native control, wxwidgets, or wxpython ?
Thanks so much!
-ck

import wx
print(wx.__version__)
app = wx.App()
frame = wx.Frame(None)
t = wx.TextCtrl(frame)

 

# *** On Windows, next line will make textctrl cursor vanish.
t.Bind(wx.EVT_SET_FOCUS, lambda x: None)

 

frame.Show()
app.MainLoop()

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