We have 2 bad bugs in Webmin and Virtualmin. I recorded a screen-cast for better understanding it. Please watch and let me know your opinion. Let's developers watch this as well, please.
The latest Virtualmin version on Vultr VPS using additional IP as virtual interface.
Webmin version 1.930
Usermin version 1.780
Virtualmin version 6.07
Installation of ubuntu and Virtualmin (not mandatory): https://screencast-o-matic.com/watch/cqjrbXt6xK
Bug 1. PHP FPM server down: https://screencast-o-matic.com/watch/cqjrbTt64I
Bug 2. Additional IP to Netplan: https://screencast-o-matic.com/watch/cqjrbat6aQ