current selected tab issue

In the following CME, pressing on the Show tabs button, select one tab (say #2), close dialog and then pressing Show tabs buttons
shows that the current tab is the first, not the one previously selected.

Any idea?

Regards

from traits.api import *
from traitsui.api import *

class Tab(HasTraits):

name = String

class Tabs(HasTraits):

current_tab = Instance(Tab)
tabs_list = List(Instance(Tab))

view = View(Group(UCustom('tabs_list',
# springy=True,
# width=300, # width value is arbitrary but required
editor=ListEditor(use_notebook=True,
dock_style='tab',
selected='current_tab',
page_name='.name'))),
kind='subpanel',
buttons=['Undo', 'OK', 'Cancel', 'Help'])
view.close_result = False

def _current_tab_default(self):
return (self.tabs_list[0])

def _tabs_list_default(self):

tabs_list = []
for i in range(3):
tab = Tab(name='tab #%d' % (i+1))
tabs_list.append(tab)
return (tabs_list)

class Foo(HasTraits):

button = Button('Show tabs')

tabs = Instance(Tabs)

view = View(Group(UItem('button')),
buttons=['Undo', 'OK', 'Cancel', 'Help'])

def _tabs_default(self):
return (Tabs())

def _button_fired(self):
print('current_tab:', self.tabs.current_tab.name)
self.tabs.edit_traits()

foo = Foo()
if __name__ == '__main__':
foo.configure_traits()

Debian x86_64, Python 3.9.2, ETS source from git, PyQt 5.15.2