panel.models.browser.BrowserInfo(p8554).webdriver given invalid value: undefined

[sanjayankur31]

Version info:

qutebrowser v2.5.4
Backend: QtWebEngine 5.15.12, based on Chromium 87.0.4280.144
Qt: 5.15.9

CPython: 3.11.4
PyQt: 5.15.9

sip: 6.7.6
colorama: 0.4.6
jinja2: 3.0.3
pygments: 2.14.0
yaml: 6.0
adblock: no
PyQt5.QtWebEngineWidgets: yes
PyQt5.QtWebEngine: 5.15.6
PyQt5.QtWebKitWidgets: yes
pdf.js: 2.13.216 (/home/asinha/.local/share/qutebrowser/pdfjs/build/pdf.js)
sqlite: 3.40.1
QtNetwork SSL: OpenSSL 3.0.9 30 May 2023

Style: Adwaita::Style
Platform plugin: xcb
OpenGL: NVIDIA Corporation, 4.6.0 NVIDIA 530.41.03
Platform: Linux-6.3.7-200.fc38.x86_64-x86_64-with-glibc2.37, 64bit
Linux distribution: Fedora Linux 38 (CompNeuro) (fedora)
Frozen: False
Imported from /usr/lib/python3.11/site-packages/qutebrowser
Using Python from /usr/bin/python3
Qt library executable path: /usr/lib64/qt5/libexec, data path: /usr/share/qt5

Paths:
cache: /home/asinha/.cache/qutebrowser
config: /home/asinha/.config/qutebrowser
data: /home/asinha/.local/share/qutebrowser
runtime: /run/user/1000/qutebrowser

Autoconfig loaded: yes
Config.py: no config.py was loaded
Uptime: 4:38:03

Does the bug happen if you start with --temp-basedir?:
Yes

Description
I'm visiting a very simple panel based site that seems to use bokeh:

https://simselect.fly.dev/project_browser

but bits of the page don't load. On looking at the devtools, I see this error in the console. I think this is a qtwebengine issue since Falkon has the same issue, but I wasn't sure how to debug it further to confirm. The URL works with Firefox + Chrome without issues.

Error rendering Bokeh items: Error: panel.models.browser.BrowserInfo(p8554).webdriver given invalid value: undefined
    at N.validate (bokeh.min.js?v=c8d72…a7e605358c68465:182)
    at N._update (bokeh.min.js?v=c8d72…a7e605358c68465:182)
    at N.set_value (bokeh.min.js?v=c8d72…a7e605358c68465:182)
    at d._setv (bokeh.min.js?v=c8d72…a7e605358c68465:179)
    at d.setv (bokeh.min.js?v=c8d72…a7e605358c68465:179)
    at d.set [as webdriver] (bokeh.min.js?v=c8d72…a7e605358c68465:179)
    at s.initialize (panel.min.js?v=aea5a…1a41689e4edbb20c:49)
    at a (bokeh.min.js?v=c8d72…a7e605358c68465:224)
    at t.build_view (bokeh.min.js?v=c8d72…a7e605358c68465:224)
    at bokeh.min.js?v=c8d72…a7e605358c68465:218

How to reproduce

Go to:

https://simselect.fly.dev/project_browser

[The-Compiler]

Reproduced on Qt 5, works fine on Qt 6.2+ (#7202). Indeed a QtWebEngine/Chromium issue (probably a missing feature they are using), nothing qutebrowser can do about this.