The SharingPermissions model defaulted public_tools and public_notes to
True while the config defaults (USER_PERMISSIONS_WORKSPACE_TOOLS_ALLOW_PUBLIC_SHARING
and USER_PERMISSIONS_NOTES_ALLOW_PUBLIC_SHARING) are both False.
On an instance whose stored user.permissions config predates these keys,
GET /api/v1/users/default/permissions fills the gap from the model and
reports both as enabled, while has_permission fills it from
DEFAULT_USER_PERMISSIONS and denies. Saving any unrelated permission then
persists the model's True, granting public tool and note sharing the admin
never enabled.
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