when your in gamemode creative mode you should not die with commands.

This will be a "Works as Intended".

Has been this way in Java Edition forever. @e selects ALL entities. Here are two ways around it:

Don't target players:
/kill @e[type=!player]

Or, don't target creative players:
/kill @e[m=!1]

Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.

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