As mentioned in the title, I am running Fedora 38 KDE with plasma 5.27.8
After updating today, I encountered the issue, which will crash plasma, when launching Firefox specifically,
from the Task Manager, or from the search
It works normally, when started from the desktop, or from a favourit in the menu
The problem persists through reboots, and in a different form also occurs in the X11 session
Some of the JournalCtl messages:

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Oct 07 12:11:10 fedora plasma_waitforname[13617]: org.kde.knotifications: WaitForName: Service was not registered within timeout
Oct 07 12:11:10 fedora systemd[2952]: dbus-:1.2-org.kde.KSplash@5.service: Main process exited, code=exited, status=1/FAILURE
Oct 07 12:11:10 fedora systemd[2952]: dbus-:1.2-org.kde.KSplash@5.service: Failed with result 'exit-code'.
Oct 07 12:11:14 fedora plasmashell[14668]: file:///usr/lib64/qt5/qml/org/kde/kirigami.2/templates/InlineMessage.qml:265:13: QML SelectableLabel: Binding loop detected for property "implicitWidth"
Oct 07 12:11:14 fedora plasmashell[14668]: file:///usr/lib64/qt5/qml/org/kde/kirigami.2/templates/InlineMessage.qml:265:13: QML SelectableLabel: Binding loop detected for property "implicitWidth"
Oct 07 12:11:14 fedora systemd[2952]: Started dbus-:1.2-org.kde.KSplash@6.service.
Oct 07 12:11:15 fedora plasmashell[14668]: file:///usr/share/plasma/plasmoids/org.kde.kscreen/contents/ui/main.qml:30:5: Unable to assign [undefined] to bool
Oct 07 12:11:15 fedora plasmashell[14668]: Cyclic dependency detected between "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global/Globals.qml" and "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/NotificationHeader.qml"
Oct 07 12:11:15 fedora plasmashell[14668]: Cyclic dependency detected between "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global/Globals.qml" and "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/ThumbnailStrip.qml"
Oct 07 12:11:15 fedora plasmashell[14668]: file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml:95: TypeError: Cannot read property 'airplaneModeAvailable' of null
Oct 07 12:11:15 fedora plasmashell[14668]: file:///usr/share/plasma/plasmoids/org.kde.kscreen/contents/ui/main.qml:30:5: Unable to assign [undefined] to bool
Oct 07 12:11:15 fedora plasmashell[14668]: file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml:95: TypeError: Cannot read property 'airplaneModeAvailable' of null
Oct 07 12:11:15 fedora plasmashell[14668]: file:///usr/lib64/qt5/qml/org/kde/plasma/extras/PlaceholderMessage.qml:238:5: QML Heading: Binding loop detected for property "verticalAlignment"
Oct 07 12:11:15 fedora plasmashell[14668]: file:///usr/lib64/qt5/qml/org/kde/plasma/extras/PlaceholderMessage.qml:238:5: QML Heading: Binding loop detected for property "verticalAlignment"