Not a Hestia issue but if anyone is testing it out on a Netcup Root server, be warned there stock Debian 11 image is seriously faulty in how they have network setup. Its aliased differently everywhere which resulted in poor web server performance as if it was looping constantly
Luckily they let you netinst from the latest dvd image which sets up the network properly. I did contact them to explain but they did the usual these are unmanaged servers bla bla bla lol and did not grasp what i was trying to say.
So if you are using Netcup i hope this helps, but i guess most of you are probably on Hetzner (i was once too !)