Thanks for your bug. All those points to your description are confusing.
Is that simply the same issue than bug #58179?
** Changed in: gnome-panel (Ubuntu)
Importance: Untriaged => Low
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Needs Info
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Panel applets break auto-hide
https://launchpad.net/bugs/54777