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
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