My guess, and I would stress it is a total guess, is either a legal challenge is being considered / put forward as an option or it is a discussion on the impact on finances etc both possible under Part 2 ?
This is based off previous comments on the below link, however the answer given during that speech indicated any challenge would have come before the listing decision itself.
It was also noted, and could explain the quick and very unusual meeting step, “Cllr Williams did mention that future steps, if listed, could include a future report to Councillors on where funding could come from to preserve the building.”
Council ‘Wont Cave In To Welsh Government Pressure’ Over Possible Groves Listing