I can reproduce the Dolphin crash on Kubuntu 26.04 LTS.

Installed versions:

Dolphin: 25.12.3 (4:25.12.3-0ubuntu1)
KIO: 6.24.0 (6.24.0-0ubuntu1)
libkf6kiogui6: 6.24.0 (6.24.0-0ubuntu1)

Observed behavior: Dolphin crashes with SIGSEGV when right-clicking
either files or directories. Disabling the Information/Preview side
panel prevents the crash in my testing.

Backtrace: The crash occurs in KJob::kill(KJob::Quietly) from
libKF6KIOGui.so.6, while QMenu::exec() is displaying the context menu.
The stack trace includes DolphinView::requestContextMenu().

This appears to match the reported FilePreviewJob timeout/subjob
lifetime issue.

I checked for available updates using apt list --upgradable, filtering
for Dolphin, KIO, and KDE Frameworks, but no matching updates were
listed.

Please consider providing the relevant upstream fix for Kubuntu 26.04
LTS.

** Attachment added: "Crash_Dolphin_kubuntu26_04.txt"
   
https://bugs.launchpad.net/ubuntu/+source/kf6-kio/+bug/2164577/+attachment/6013046/+files/Crash_Dolphin_kubuntu26_04.txt

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https://bugs.launchpad.net/bugs/2164577

Title:
  Dolphin crashes in KJob::kill() when FilePreviewJob timeout fires
  while context menu is open

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