Accodion and vard break children link

[ItamarShDev]

Using panel 0.10.1

In the following snippet, the linking is broken:

import panel as pn
pn.extension()

w1 = pn.widgets.Spinner(name='Text:', step=0.1)
w2 = pn.widgets.FloatSlider(name='Slider')

def update_value(elm, change):
    elm.value = change.new

w1.link(w2, {'value': update_value})

card = pn.Card(w1, w2, title='Card', background='WhiteSmoke')
card

Changing it to Row/Column fixes it:

import panel as pn
pn.extension()

w1 = pn.widgets.Spinner(name='Text:', step=0.1)
w2 = pn.widgets.FloatSlider(name='Slider')

def update_value(elm, change):
    elm.value = change.new

w1.link(w2, {'value': update_value})

row = pn.Row(w1, w2)
row

[philippjfr]

Duplicate of #1750 and fixed in #1750