sortable inside tab doesn't work unless that tab opens first.

sortable inside tab doesn't work unless that tab opens first.

i have a tabset that contains a sortable list that draggable objects
can be dragged into. i have the cookie setting for the tabs as well.
the sortable works when that tab opens first due to the cookies, but
does not work when another tab is selected then i switch tabs. any
reason for this?
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