Dying causes camera to disjoin from player, relogging has no effect.
To recreate: Die in 20w13a
You will respawn normally but the world will not update (Ex. Breaking one of the portal blocks will not update the rest)
On rejoin you will be dead, hitting respawn places player at spawn point, camera inside of head, with no control of the player.
Thank you for your report!
We're actually already tracking this issue in MC-175988, so I've 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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