Issue description:
My wife and me playing a modpack on a dedicated server.
Her personal teleporter stay functional with all frequencies as long as she doesn't relog. As soon as she does, her pers. teleporter gets ownership null.
Sneaking right click doesn't change ownership. It stays null and no frequencies are visible and/or usable.
She can enter its gui and if she crafts a new one, she'll have a correct ownership with all frequencies.

Being op'ed had no influence as I just tested it.
We're of course using the same ISP and LAN, dunno if that might be the issue here.

I did some screenshots where you can see the owner state before and after crafting a new one.
Let me know if those are from interest.

Steps to reproduce:

1. Being at the same house with same external ip, joining dedicated server
2. Craft personal teleporter, use it to set initial ownership
3. After relogging the ownership turns null and therefore unusable

Version :
Forge: 32.0.108
Mekanism: 10.0.9.432
Other relevant version: Modpack: Valhelsia 3 on its version 3.0.17

Server and client latest logs:
https://gist.github.com/GrandMJ/417741585e8bf47720021dfc26e5ed58

As I did some testing, she built a security desk and threw all personal teleporters in to clear the ownership.
Then she re-owned one of them and that ownership now remains after relogging and is fully usable.

I believe this most likely will be fixed by the fixes I made in 6fd2c93 given it seems frequencies just weren't fully working properly on servers to begin with. Though I didn't do enough testing to reproduce this specific issue to confirm that the changes fixes it.

I'm unable to reproduce this issues following the 6fd2c93 code changes.