Single book mark event is not return the event response.

Question

I try to add a book mark event like this:

speechSynthesizer.BookmarkReached.addEventListener((o, e) -> {  
  sceneEndOffsets.add(e.getAudioOffset());
  sceneIds.add(Long.valueOf(e.getText()));    
  logger.info("[{}] Synthesis Book mark reached event at sceneId: {} at: {}", projectId, e.getText(), e.getAudioOffset());});

And the ssml Str is:

the ssml strs length is:1 send to azure ssml is:[
<speak xmlns="http://www.w3.org/2001/10/synthesis" xmlns:mstts="http://www.w3.org/2001/mstts" xmlns:emo="http://www.w3.org/2009/10/emotionml" version="1.0" xml:lang="en-US">
<voice name="en-US-MichelleNeural">
<mstts:express-as style='general'>Once upon a time, there were three little pigs, each with a unique idea for a home. 
<break time='300ms'/>
<bookmark mark='1146046135043973121'/>
</mstts:express-as>
</voice>
</speak>
]

But this event log is not always print out.

The book mark event not response is a surge in these two days. It cause many error in my system.

For now, just find the single book mark event have the no response issue. If I send many bookmarks in a long ssml str, The probability of this error going down a lot.

Thank you so much for your response.