Debian testing can't tab to desktop?

Chevelle <[email protected]>
Newsgroups gmane.linux.debian.devel.accessibility
Message-ID <[email protected]> 
Hello, I upgraded a Mate Bookworm plus Backports to Debian Testing.  
When I press alt-control-tab, I cycle between the Top Panel and Bottom 
Panel, but not the desktop.  On the Bottom Panel is a button that says 
Show Desktop, I press space on that, but it doesn't make any 
difference.  Any idea how to bring back the desktop?
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