Naza sent out an email (22/1/2020), they acknowledge there is a delay in distributing the IRS. They gave 2 options i.e.

Option 1: any unpaid IRS Payment is to be made upon VP with additional interest of 8% p.a. calculated on daily basis.
Option 2: any unpaid IRS Payment is to be made in accordance with IRS schedule.

1 week to respond, other default option will be selected i.e. option 1.

Hope the above is helpful.

As I understand, the developer managed to convert the land from leasehold to freehold. The price was much lower before the conversion.