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It seems like changing the window handle to null in PeekMessageW solved the issue:

```d
BOOL bret = PeekMessageW(&msg, null, 0, 0, PM_REMOVE);
```

Then I can still get the window handle source like this:

```d
output.handle = msg.hwnd;
```

Win32 API is just really not intuitive, and many behaviors are not well documented.