Attempting to exit and save a singleplayer world while simultaneously running in offline mode and using a username that is not claimed by anyone else causes the game to softlock at the “Saving world” screen. The issue does not happen when the computer running the game is actually offline.
MC-301824
Softlock trying to save singleplayer worlds in offline mode while using an unclaimed username
Resolved
Invalid
0
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers like Hypixel, please contact them first as they run modified server software.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki