FTL Bug: Being moved to Echo while FTL will give notifications for people being added to your previous fireteam, despite you not being in the old Squad.

## Testmerges
#10926: 'Medals Overhaul' by realforest2001 at commit 7a0acab23d
#10999: 'Fix of various plane related issues' by Blundir at commit f85a7153c4
#11136: 'Coms Rolling Encryption & Punchcards' by Drulikar at commit 2d55de8084
#10954: 'Liquid fuel decals now ignite & Toxic no longer destroys weeds' by Drulikar at commit fd225b3883
#10611: 'White Antre Research Facility - Ground Map' by Steelpoint at commit ae4031871b
#11124: 'Lighting optimizations' by kalazus at commit fb7ee6f2b8
#9948: '[code bounty] Despoiler' by cuberound at commit 03149bc720
#9952: '[code bounty] Burn changes for Despoiler ' by cuberound at commit 8f418469f8
#11170: '[WIP] Yautja Survivor' by realforest2001 at commit 5876f0ca79
#9141: 'Shield Code backend rewrite.' by realforest2001 at commit 0e157f92f7

## Round ID
31112

## Description of the bug
Title.

## What's the difference with what should have happened?
It shouldn't happen.

## How do we reproduce this bug?
I think this is the exact order of things that happened:
Wake up as FTL1
Be moved to Echo while FTL1
Have your old SL move people into FTL1
You get notifications in chat of people being added to your fireteam, but you're alone in Echo.

## Attached logs
```
N/A
```

## Additional details
- Author: DangerRevolution
- Admin: SmellyHippie
- Note: None