DNS zone doesn't get updated in preview of NOC DNS Zones tab

Steps to reproduce

1. Create DNS Zone

2. Add some records

What is the current bug behavior?

Zone gets generated in datastream, sent correctly to connected servers, but preview is empty in NOC DNS Zones tab.

What is the expected correct behavior?

Zone in preview

Relevant logs and/or screenshots

Possible fixes

Seems serial is not getting updated, maybe the cause.

Paste NOC version (./noc about)

NOC version is: 20.3