What does HRESULT 0x80242016 (WU_E_UH_POSTREBOOTUNEXPECTEDSTATE) mean?

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WU_E_UH_POSTREBOOTUNEXPECTEDSTATE means the update finished its post-reboot phase but ended in an unexpected state.

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WU_E_UH_POSTREBOOTRESULTUNKNOWN	WU_E_UH_NEW_SERVICING_STACK_REQUIRED

WU_E_UH_POSTREBOOTUNEXPECTEDSTATE

WU_E_UH_POSTREBOOTUNEXPECTEDSTATE means Windows Update expected a specific result after reboot, but the update state it read back did not match.

Check whether the update was partially installed, superseded, or rolled back during boot processing.
Review the boot-time and CBS-related entries around the reboot window.
Do not assume the update is simply missing; first verify the actual installation state in the package history and logs.