Weird PhraseRecognizer Error Message

I am implementing some Speech Recognition, and following the example (for the GrammarRecognizer) of this link, I get the example to work, but every single time I get to start the GrammarRecognizer I get this error message in Unity:

 'NULL == handler->m_Next'
 UnityEngine.Windows.Speech.PhraseRecognizer:Start ()

But the recognition works, so I don't understand why the error appears but yet, everything works. The error points to this line:

 myGrammarRecognizer.Start();

And I cant find anything regarding this error. Anyone has any idea of what this can be related to?

Btw, I'm using Unity 2020.2 (Beta 12).