[Falkon] [Bug 486028] New: Content of some (React/Nuxt/NodeJS based?) websites disappear after loaded

[acidrums4]

https://bugs.kde.org/show_bug.cgi?id=486028

            Bug ID: 486028
           Summary: Content of some (React/Nuxt/NodeJS based?) websites
                    disappear after loaded
    Classification: Applications
           Product: Falkon
           Version: 23.08.5
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: acidrums4+stuff at gmail.com
  Target Milestone: ---

SUMMARY
The content in some websites will suddenly disappear after its content is fully
loaded, for example:

https://fedoraproject.org/workstation/download
https://www.olimpica.com/
https://www.specialized.com/

STEPS TO REPRODUCE
1. Open any of the websites aforementioned in Falkon.
2. Wait until they load.

OBSERVED RESULT
Their content will disappear all of a sudden without any clue (sans the
specialized one, where they ask to see the console).

EXPECTED RESULT
Their content will be shown and the user can see and interact with it normally.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.8
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13

ADDITIONAL INFORMATION
I could test this behavior on both my daily driver system (Gentoo) and with
Fedora on a fresh-out-of-the-box installation. I'll get some weird errors that
won't happen on other browsers while interacting with elements of certain
websites, i.e. an everhour widget inside a Trello card no longer works due to a
"ReferenceError: structuredClone is not defined" error.

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