I have created a custom script which run before and after domain modifications like this tutorial: https://www.virtualmin.com/documentation/developer/prepost
System > Virtualmin Configuration > Actions upon server and user creation > Command to run after making changes to a server
But it doesn't work for sub server modifications. I also tried "Command to run after making changes to an alias" but it still doesn't work for Sub Servers. I don't really want to create sub-servers as top level servers as I have few of top level servers but hundreds of sub servers.
It is a bug or am I supposed to look into any other settings?