the keep inventory does not remain activated

Cannot reproduce, make sure there's not command blocks or functions turning it off again.

I cannot reproduce this behavior either in 1.19.2 or 1.19.3 Pre-release 2. Please attach some screenshots or videos demonstrating the problem here while the F3 debug screen is enabled. This would greatly assist in diagnosing the potential issue. Thanks in advance!

_{This issue is being temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.}

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The video attachment you've provided shows the "keepInventory" gamerule functioning as intended when it's enabled. Could you please clarify what the problem is here?

well 
I don't know why but it works now sorry for the inconvenience

No worries! We'll be resolving this report as "Invalid" since the problem here has been resolved.