When DNS for domain is disabled, the secondary name server (slave on other system) does not release the domain

SYSTEM INFORMATION
OS type and version Debian Linux 11
Usermin version 2.302
Virtualmin version 7.30.8
Theme version 24.02
Apache version 2.4.65
Package updates All installed packages are up to date
In Virtualmin → Edit Virtual server, when I uncheck DNS for domain for the virtual server, the secondary name server (slave on some other Webmin / Virtulmin system) does not release the domain.

Is this a bug?

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