The header_filters parameter of the tabulator widget cause bug when it is embedded in another tabulator

[c-stephan]

ALL software version info

panel-0.13.1

Context

I tried to create a tabulator widget with row_content, this content is another tabulator widget. Everything worked perfectly until I tried to add a header_filter as a parameter to the widget that is in the row_content.
By adding the header_filter parameter to a dataframe that does not have the same column types as the 'global' widget the content is not displayed.

Here is a minimal example:
(The first three lines are for reference, the problem is in the fourth line of the widget.)

import pandas as pd
import panel as pn
import numpy as np
import datetime as dt
pn.extension('tabulator')

df = pd.DataFrame(np.random.randint(0,100,size=(4, 4)), columns=list('ABCD'))
df2 = pd.DataFrame(np.random.randint(0,100,size=(4, 3)), columns=list('EFG'))
df3 = pd.DataFrame({
    'int': [1, 2, 3],
    'float': [3.14, 6.28, 9.42],
    'str': ['A', 'B', 'C'],
    'bool': [True, False, True],
    'date': [dt.date(2019, 1, 1), dt.date(2020, 1, 1), dt.date(2020, 1, 10)],
    'datetime': [dt.datetime(2019, 1, 1, 10), dt.datetime(2020, 1, 1, 12), dt.datetime(2020, 1, 10, 13)]
}, index=[1, 2, 3])

tab1 = pn.widgets.Tabulator(df, header_filters=True)
tab2 = pn.widgets.Tabulator(df2, header_filters=True)
tab3 = pn.widgets.Tabulator(df3)
tab4 = pn.widgets.Tabulator(df3, header_filters=True)

content_fn = lambda row: tab1 if row.name == 0 else (tab2 if row.name == 1 else (tab3 if row.name == 2 else tab4))

tabulator = pn.widgets.Tabulator(
            df, layout='fit_columns',
            sizing_mode='stretch_width',
            row_content=content_fn, embed_content=True, expanded=[0,1,2,3])

tabulator

The problem is visible in the console of my browser: