Hi, Harry Sheng,
I think this is because your "windows list" applet has been hidden, and you
can right click the panel and choose "reset the panel".
** Also affects: ukui-panel (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1764914
Title:
[taskbar]The opening app didn't show in taskbar sometimes.
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