Jitsi meet, duplicate strings

Hi there,

I've hooked up vosk-server with jitsi-meet to transcribe my meetings. The issue I'm having is that I'm getting duplicate lines. See the below transcription:

```
Transcript of conference held at Jan 25, 2021 in room roomname@conference.meet.domain.com
Initial people present at 9:08:30 PM:

Transcript, started at 9:08:30 PM:
________________________________________________________________________________
<9:08:30 PM> User: joined the conference
<9:08:34 PM> User: testing
<9:08:34 PM> User: testing testing
<9:08:38 PM> User: hello
<9:08:39 PM> User: hello this is
<9:08:39 PM> User: hello this is user
<9:08:45 PM> User: why are you
<9:08:45 PM> User: why are you doubling my
<9:08:46 PM> User: why are you doubling my speech
<9:08:51 PM> User left the conference
________________________________________________________________________________

End of transcript at Jan 25, 2021 9:08:53 PM
```

Is this a problem with vosk or a problem with the jitsi-meet client not sending some sort of command to end the stream and then return the text?