sorry for bad English :(
mods: Spaec Exploration , Krastorio2 , Jetpack (all newest)
Avatars in the space station open jetpack (use key J) and save game ,then dissonnect after load game ,you will make you "Could not find avatar (name)"
/c remote.call('Avatars', 'repair_avatars_listing') not work and use satellite perspective watch can see avatar just stand there

if a missing avatar back to Nauvis or any planet will get reset and take effect

Strange. Can you provide me with a save that has a space station?

https://drive.google.com/file/d/1hbdwxpOlpromSpahT9poLeVgMPkp8Lda/view?usp=sharing
avatar contorl center in (9,-238) and astronaut01 on space station

This save is a multiplayer save originally, correct?

Ok, this is an issue with the Jetpack mod. I have posted on their Discord to see if they can fix it.

For now, you can recover the avatar with the following steps:
1. Press key J twice, to start flying then to land
2. Disconnect from the avatar
3. Run /c remote.call('Avatars', 'repair_avatars_listing')

yes ,im host and thx :)