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ALL software version info

(this library, plus any other relevant software, e.g. bokeh, python, notebook, OS, browser, etc)

browsers: Chromium, Firefox
python                    3.12.2          hab00c5b_0_cpython    conda-forge
bokeh                     3.4.0              pyhd8ed1ab_0    conda-forge
panel                     1.4.1              pyhd8ed1ab_0    conda-forge

Description of expected behavior and the observed behavior

The app selection window is displayed in black/white, the link to panel website (blue icons) no longer works. Browser console output show missing thumbnails - shown on the included screenshot. I do not recall seeing them before. Those messages are also printed to stdout:

/tmp python foo.py 
Launching server at http://localhost:50000
404 GET /thumbnails/foo.png (::1) 0.33ms
404 GET /thumbnails/admin.png (::1) 0.14ms

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

# code goes here between backticks
import panel as pn

pn.extension(theme='dark')

def foo():
    return pn.template.FastListTemplate(
            main=[pn.pane.Markdown('Some text here')],
            title='Test',
            )

pn.serve({'foo': foo}, show=False, admin=True, port=50000)

Stack traceback and/or browser JavaScript console output



Screenshots or screencasts of the bug in action

• I may be interested in making a pull request to address this