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UCEERR_MISSINGBEGINCOMMAND
UCEERR_MISSINGBEGINCOMMAND is a Windows User Composition Engine (UCE) HRESULT. It indicates that the engine received a command sequence without the required opening command or valid initial state.
What to check
- Check dispatcher lifecycle and verify that rendering work is not submitted after channel initialization failed.
- Look for an earlier render-thread or transport error that prevented the command sequence from starting.
- Reduce the scenario to basic window creation and a simple visual tree to isolate initialization failures.
Microsoft guidance for WPF render-thread failures
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