IME (Japanese) text input problem in StageWebView on Windows

Our application uses the StageWebView with HTML textarea form elements for text input, but when trying to use IME (Japanese) text input from the keyboard, the characters do not immediately appear in the textarea, as they appear in a separate IME input window, and the characters are not transferred into the textarea until the user presses the enter key.

Normal textfields (InputText) work fine, and IME is enabled (by default), so this appears to be a problem with the StageWebView class.

So this appears to be a bug with StageWebView