Dynamically added pn.bind components are loading forever if defer_load is True

[TheoMathurin]

Panel 1.3.4

As the title implies, pn.bind components that are added to the layout after initial page render are forever loading.

import panel as pn
import panel.widgets as pnw

pn.extension(defer_load=True)


def square(x):
    return f'{x} squared is {x**2}'


def add_component(event):
    x = pn.widgets.IntSlider(name='x', start=0, end=100)
    content.append(pn.Column(pn.bind(square, x), x))


button = pnw.Button(name='Add component', on_click=add_component)
content = pn.Column(button)
content.servable()

No error is thrown.