Yes, multiplayer save stability is something the developers are actively working on, as desyncs and broken map terrain upon loading are known issues in the current builds. For now, it's best to avoid reloading online saves mid-game until a proper fix is patched. If you're tired of losing your progress to bugs like this and just want to bypass the broken grind, you can check out https://skycoach.gg/ to level up faster without dealing with server glitches, but hopefully, the devs will fix the host files soon. I hope this really helps. Let me know.