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UCEERR_MISSINGENDCOMMAND
UCEERR_MISSINGENDCOMMAND is a Windows User Composition Engine (UCE) HRESULT. It indicates that the engine received an incomplete command sequence without the required closing command.
What to check
- Treat the result as evidence of an interrupted or malformed composition channel rather than a normal UI error.
- Check for crashes, cancellation, shutdown, or transport failures that occurred while rendering work was in progress.
- Capture a dump and the earliest relevant exception if the failure is reproducible.
Microsoft guidance for WPF render-thread failures
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