When you die in hardcore mode it gives you 2 options. Spectate world and Delete world. if you click spectate world, all is good but if you click delete world, the minecraft main menu background picture is a freeze-frame of when you died and you can't load/create any other world. And when you ALT TAB out, minecraft stops responding and you have to close it from task manager.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-96521, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Please do not mark unreleased versions as affected.
You don't have access to them yet.