If it's a bug, then reinstalling won't do anything. You could try first creating a new user and checking out that happens with it too. Also, open a bug - it will help others too.
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Not sure how you determined a reinstall is going to solve the problem. Looks like a bug. I’d suggest filling bug report.
It’s pretty trivial to “reset” the desktop to default if you think there’s config file problem rather than a bug with a recent release. Again, can’t really wrap my head around a reinstall solving this.
Two top comments are exactly right: file a bug ticket.
Just wanted to tag on that reinstalling an entire Linux environment really makes no sense ever, unless you're sure you nuked some kind of files belonging to a crucial package, in which case, you just reinstall the package. There is absolutely no good reason for a full install of the OS, ever.
Try to switch to the different display server (to Wayland if you're on X11 or the other way around)
Isn't the resize application launcher a plasma widget? If it is, have you checked its compatibility with plasma 6?