keepalive.sc doesn't load fake players past the first one

[popodogecodes]

Describe the bug
On server restart, only the first fake player will be loaded by the script.

To Reproduce
Steps to reproduce the behavior:

1. On a new fabric server instance, install carpet.
2. Spawn 2 or more fake players
3. Stop the server
4. Start the server

Expected behavior
Respawn all the fake players upon server start

Screenshots

Environment

• Carpet version: v1.4.121
• Minecraft version: v1.20.2

Additional Comments
The callback does still fail even if you only have 1 fake player saved, though it doesn't seem to have much of an effect, only affects multiple fake players.