https://bugs.kde.org/show_bug.cgi?id=409030

--- Comment #3 from alo...@gmx-topmail.de ---
I experimented further and found out the following additional details:
* A reliable way to reproduce is to open any panel widget, click outside of it
to close it. Then it will never open again until plasmashell is restarted.
* When closing the widget by clicking the panel icon again, I could never
reproduce this bug.
* When double-clicking on a panel icon, plasmashell will restart.
* Menus in some applications (e.g. KCachegrind, Konsole, Spyder, KDevelop,
TeXworks) will only open once. Other applications (e.g. KeePassXC, VLC) are not
affected.
* Downgrading Plasma to 5.15.5 does *not* help.
* Downgrading KDE Frameworks to 5.58.0 does *not* help.
* Downgrading Qt to 5.12.3 *does* help.
* This appears to be related to the problems experienced in [0], suggesting the
bug is in Qt.

[0]
https://www.reddit.com/r/kde/comments/c2fl8y/regression_bug_in_qt_5124_and_probably_513_too/

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