The bulk update request #9684 is pending approval.

remove alias belly_button_swirl (0) -> invalid_tag (1)

Reason:

alias belly_button_swirl -> spiral_navel
imply spiral_navel -> navel

Matches x_navel. Probably really undertagged

Sounds fine to me, it's a reasonably unique shape and x_navel has already been canonised with implications.

Not really sure why anybody felt the need to invalidate this in the first place. To invalid_tag of all things, not even navel.