I can confirm this doing the steps you provided. This is really wired.
I attached a screencapture. I opened two applications (epiphany and evolution):
1. When I firstly hober the panel, one can see the window list and both
applications in it
2. __While__ I secondly hover it, I pressed [ALT] + Tab and as you can see the
window list is gone
** Changed in: gnome-panel (Ubuntu)
Status: Incomplete => Confirmed
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Window list disappears in lower gnome-panel when dissension is inactive and
automatic hide is active
https://bugs.launchpad.net/bugs/296407
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