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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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.
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