matplotlib interactive (ipympl) cannot be shown

[YongcaiHuang]

ALL software version info

Software Version Info

Package                   Version
------------------------- --------------
absl-py                   2.1.0
altair                    5.5.0
anyio                     4.7.0
appnope                   0.1.4
argon2-cffi               23.1.0
argon2-cffi-bindings      21.2.0
arrow                     1.3.0
asttokens                 3.0.0
async-lru                 2.0.4
attrs                     24.2.0
babel                     2.16.0
beautifulsoup4            4.12.3
bleach                    6.2.0
bokeh                     3.6.2
cattrs                    24.1.2
certifi                   2024.8.30
cffi                      1.17.1
charset-normalizer        3.4.0
comm                      0.2.2
contourpy                 1.3.1
cycler                    0.12.1
debugpy                   1.8.9
decorator                 5.1.1
defusedxml                0.7.1
docstring-to-markdown     0.15
executing                 2.1.0
fastjsonschema            2.21.1
flatbuffers               24.3.25
fonttools                 4.55.2
fqdn                      1.5.1
h11                       0.14.0
httpcore                  1.0.7
httpx                     0.28.1
idna                      3.10
imageio                   2.36.1
ipykernel                 6.29.5
ipympl                    0.9.4
ipython                   8.30.0
ipython-genutils          0.2.0
ipywidgets                8.1.5
isoduration               20.11.0
jax                       0.4.36
jaxlib                    0.4.36
jedi                      0.19.2
jedi-language-server      0.42.0
Jinja2                    3.1.4
joblib                    1.4.2
json5                     0.10.0
jsonpointer               3.0.0
jsonschema                4.23.0
jsonschema-specifications 2024.10.1
jupyter_client            8.6.3
jupyter_core              5.7.2
jupyter-events            0.10.0
jupyter-lsp               2.2.5
jupyter_server            2.14.2
jupyter_server_terminals  0.5.3
jupyterlab                4.3.2
jupyterlab-lsp            5.1.0
jupyterlab_pygments       0.3.0
jupyterlab_server         2.27.3
jupyterlab_widgets        3.0.13
kiwisolver                1.4.7
lazy_loader               0.4
linkify-it-py             2.0.3
lsprotocol                2023.0.1
Markdown                  3.7
markdown-it-py            3.0.0
MarkupSafe                3.0.2
matplotlib                3.9.3
matplotlib-inline         0.1.7
mdit-py-plugins           0.4.2
mdurl                     0.1.2
mediapipe                 0.10.18
mistune                   3.0.2
ml_dtypes                 0.5.0
narwhals                  1.16.0
nbclient                  0.10.1
nbconvert                 7.16.4
nbformat                  5.10.4
nest-asyncio              1.6.0
networkx                  3.4.2
notebook_shim             0.2.4
numpy                     1.26.4
opencv-contrib-python     4.10.0.84
opt_einsum                3.4.0
overrides                 7.7.0
packaging                 24.2
pandas                    2.2.3
pandas-flavor             0.6.0
pandocfilters             1.5.1
panel                     1.5.4
param                     2.1.1
parso                     0.8.4
patsy                     1.0.1
pexpect                   4.9.0
pillow                    11.0.0
pingouin                  0.5.5
pip                       24.3.1
platformdirs              4.3.6
prometheus_client         0.21.1
prompt_toolkit            3.0.48
protobuf                  4.25.5
psutil                    6.1.0
ptyprocess                0.7.0
pure_eval                 0.2.3
pycparser                 2.22
pygls                     1.3.1
Pygments                  2.18.0
pyparsing                 3.2.0
python-dateutil           2.9.0.post0
python-json-logger        2.0.7
pytz                      2024.2
pyviz_comms               3.0.3
PyYAML                    6.0.2
pyzmq                     26.2.0
referencing               0.35.1
requests                  2.32.3
rfc3339-validator         0.1.4
rfc3986-validator         0.1.1
rpds-py                   0.22.3
scikit-image              0.24.0
scikit-learn              1.5.2
scikit-posthocs           0.11.1
scipy                     1.14.1
seaborn                   0.13.2
Send2Trash                1.8.3
sentencepiece             0.2.0
setuptools                75.6.0
six                       1.17.0
sniffio                   1.3.1
sounddevice               0.5.1
soupsieve                 2.6
stack-data                0.6.3
statsmodels               0.14.4
tabulate                  0.9.0
terminado                 0.18.1
threadpoolctl             3.5.0
tifffile                  2024.9.20
tinycss2                  1.4.0
tornado                   6.4.2
tqdm                      4.67.1
traitlets                 5.14.3
types-python-dateutil     2.9.0.20241206
typing_extensions         4.12.2
tzdata                    2024.2
uc-micro-py               1.0.3
uri-template              1.3.0
urllib3                   2.2.3
wcwidth                   0.2.13
webcolors                 24.11.1
webencodings              0.5.1
websocket-client          1.8.0
widgetsnbextension        4.0.13
xarray                    2024.11.0
xyzservices               2024.9.0

Description of expected behavior and the observed behavior

matplotlib interactive (ipympl) cannot be shown with error: 500: Internal Server Error. Also, on documentation page, interactive plot cannot be shown as well

Complete, minimal, self-contained example code that reproduces the issue

import matplotlib.pyplot as plt
import numpy as np
import panel as pn

fig = plt.Figure(figsize=(8, 6))
ax = fig.add_subplot(111)

dx, dy = 0.05, 0.05

# generate 2 2d grids for the x & y bounds
y, x = np.mgrid[slice(1, 5 + dy, dy),
slice(1, 5 + dx, dx)]

z = np.sin(x)**10 + np.cos(10 + y*x) * np.cos(x)

cf = ax.contourf(x + dx/2., y + dy/2., z)
fig.colorbar(cf, ax=ax)

pn_fig = pn.pane.Matplotlib(fig, interactive=False)
pn.serve(pn_fig)

Screenshots or screencasts of the bug in action