Namedmanager v1.9.0 - Adding own NS records fails

[Twilight-Networks]

I would like to add an additional NS record in the "Nameserver Configuration" to sub-delegate the domain to another Nameserver.
As soon as I click on "Save Changes", the new entry is gone and the fields are empty again..

No Error-Message appears:

Notification:

Domain updated successfully - name servers scheduled to reload with new domain configuration 

Am I doing something wrong or is it a bug?

Greetings from Germany :)

[gerard780]

Revert the changes made in a4c1377 and it will start working again. ie remove , IDNA_DEFAULT, INTL_IDNA_VARIANT_2003