There is a bug to where if you die most if not all of your stuff will despawn even if you go straight to where you die
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Cannot reproduce in 1.15.2
Thank you for your report!
We're actually already tracking this issue in MC-144768, 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 in the future to see if the issue has already been reported.
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Did you die in lava or have curse of vanishing enchantments on your gear?