Can you try if the following command helps?

sudo dnf install plasma5support

Got this using strace -f -o kate_crash.log kate -n (compressed with zstd)

unfortunately it did not help

I don't know if any of the uploads was successful because I am told I am not allowed to upload those file types.
Here is a link to the file: https://drive.google.com/file/d/14VsPIhZSNWxI7qJdWfWDzNXw0LWiNvzp/view?usp=drive_link

After a closer look, the ICU library conflict we found (multiple versions of libicuuc loaded via the hfstospell → libxml++ chain) is a packaging issue we will fix, but it is probably not the cause of your crashes — otherwise other users with the same packages would also be affected.

What is unique to your system is the NVIDIA GTX 780 with the legacy nvidia_470 driver. This is a very old driver (Kepler architecture, 2014) and Qt6 6.11 is a very recent release. The crashes happen consistently during rendering (scrolling), and the segfault is inside libQt6Core during X11 rendering operations. This is consistent with a Qt6 6.11 / nvidia_470 driver incompatibility, where Qt uses a GLX code path that the old driver does not handle correctly.

This would also explain why Edge and VSCode work fine (they have their own graphics stack) and why other users do not see this issue.

Unfortunately there is no easy fix on our side for a proprietary legacy driver issue. A few things worth trying:

1. Force software rendering for Qt6 to see if that makes the crashes disappear:
QT_XCB_GL_INTEGRATION=none kate -n

2. If that helps, you can make it permanent for all Qt6 apps:
echo "export QT_XCB_GL_INTEGRATION=none" >> ~/.profile

3. Alternatively, try with the nouveau open-source driver if that is an option for you.

[NOTE: AI generated reply]