Spontaneous closure of the grid cell editor

Hey. In wxpython41, I noticed strange mesh behavior when editing cells.

I give a code example.

import wx
import wx.grid


class Frame(wx.Frame):

    def __init__(self, parent):
        super().__init__(parent)

        vbox = wx.BoxSizer(wx.VERTICAL)

        grid = wx.grid.Grid(self, size=(384, 128))
        vbox.Add(grid, flag=wx.ALL, border=5)

        vbox.Fit(self)
        self.SetSizer(vbox)
        self.Layout()

        grid.CreateGrid(3, 3)
        table = grid.GetTable()  # type: wx.grid.GridTableBase

        table.SetValue(0, 0, '11')
        table.SetValue(1, 0, '22')

        grid.SetCellEditor(0, 0, wx.grid.GridCellNumberEditor())
        grid.SetCellEditor(1, 0, wx.grid.GridCellNumberEditor())
        grid.SetCellRenderer(0, 0, wx.grid.GridCellNumberRenderer())
        grid.SetCellRenderer(1, 0, wx.grid.GridCellNumberRenderer())


if __name__ == '__main__':
    app = wx.App()
    frame = Frame(None)
    frame.Show()
    app.MainLoop()

The problem is that I switch to cell editing mode, and then move the cursor 
to the borders of the edited cell, the editor automatically closes.

In previous versions, exit from editing mode occurred only when the editor 
lost focus.

Why is this happening?

WxPython 4.1.0
Python 3.7.7
Windows 10

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