When you create a Hardcore world and are in the game, you can press "ESC", then click on "Open to LAN", and then set "Allow cheats" to "On". After that, by clicking on "Start LAN World", you can use cheat commands, even though it shouldn't be possible.
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Viradex
violine1101
Thank you for your report!
We're tracking this issue in MC-134, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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migrated
Duplicate of MC-134.