Panel Layout Issue - can not stretch width properly

Hi

I am get a layout issue with stretch width. It seems there is some issue on MultiChoice widgets

Here is example code:

wiht out MultiChoice works good:

import panel as pn
pn.extension(sizing_mode = 'stretch_width')

button = pn.widgets.Button(name ='a')
multichoice = pn.widgets.MultiChoice(
    name='Plant selection', 
    value   =['a', 'b', 'c','d', 'e','f','g', 'h', 'i','j'],
    options =['a', 'b', 'c','d', 'e','f','g', 'h', 'i','j','k','l'])#

pn.Column(
    pn.Row(button,button,button,button,button,button,button,button,button,button),
    
)

add multichoice, there is an layout issue

Is there an issue on the widgets or something wrong with the way i am doing layout

Victor