Collapsed Relationship Panel not shown when used in Tab Panel

[crynobone]

@ryangurn @crynobone if relationship field's collapsed status has been saved in browser's local storage and then you put them in new "tabs" panel introduced in Nova 5.0+, they will be hidden. you can clear browser storage cache for the site to fix it.
I don't know if it counts as a bug but a fix would be nice.

Originally posted by @mziraki in #6636 (comment)