1 Day Lock in Period is applied on "All" Tata Sky Curated Packs and Tata Sky Add Ons / Mini Packs. While 0 Day Lock in Period is still there on Tata Sky Regional Packs.
It's from many years. All DBR topups were having 0 lock-in period. We used to add those topups in morning & remove in the evening. I think it's not a bug because few times I've called CC for activating them & they used to tell that it's a DBR topup & doesn't have any lock-in period, you can remove it anytime.
PDF of FTA Basic was updated on 19 MAY, while broadcaster packs were updated on 14 MAY, both still have 0 day lock in period despite of 1 day mentioned in PDF.
Maybe 0 day lock in period is being provided on Complimentary basis and can be revoked anytime