A server is hosted on your pc when you play single player, even if "open to lan" is not on.

A server is hosted on your pc when you play single player, even if "open to lan" is not on.

*What I expected to happen:
When you play "Single Player" without "Open To Lan" on, your device should not be hosting a server, that no one can join.

*What actually happened was:
I was in single player and i notice "Open To Lan" was not on, but i could tell a server was being hosted on my device. I knew this because i was experiencing "Block Lag" (when you break a block and it takes along time pop into a item) like on servers. But i was not on a server i was in a single player world

*Steps to Reproduce:
1. Put your settings real high
2. create a new world
3. break a block

*Things to note:
if this was intentional to have essentially a single player server or a server that only you can join on your device. then why are you doing this it wastes resources on devices. also if this was so you can have the open to lan feature, ok i see why. you need a server for the other person to join into but the server should only be active when open to lan is turned on. if open to lan is off, there should be no single player server.

what brought this to my attention is in minecraft pe / win10 you get an option to turn off the single player server. you only get a server hosted on your device if you turn on "Multilayer Game" this saves on resources and should also be a feature on the Java edition as well.

also i know this is pretty much useless because this is only a problem for pc's over 5 years.