Unable to label more than four regions of an audio file

Label Studio Support
1

I am running into a strange setup with an audio transcription task I’m trying to complete. I am able to label four regions of my file without any issue, but as soon as I attempt to label a fifth I get an error and the following stack trace:

Traceback (most recent call last):
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/generics.py", line 242, in post
    return self.create(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/mixins.py", line 17, in create
    serializer = self.get_serializer(data=request.data)
                                          ^^^^^^^^^^^^
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/request.py", line 216, in data
    self._load_data_and_files()
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/request.py", line 279, in _load_data_and_files
    self._data, self._files = self._parse()
                              ^^^^^^^^^^^^^
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/request.py", line 329, in _parse
    stream = self.stream
             ^^^^^^^^^^^
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/request.py", line 203, in stream
    self._load_stream()
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/request.py", line 309, in _load_stream
    self._stream = io.BytesIO(self.body)
                              ^^^^^^^^^
  File "/home/op/label-studio/lib/python3.11/site-packages/rest_framework/request.py", line 416, in __getattr__
    return getattr(self._request, attr)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/op/label-studio/lib/python3.11/site-packages/django/http/request.py", line 330, in body
    raise RawPostDataException("You cannot access body after reading from request's data stream")
django.http.request.RawPostDataException: You cannot access body after reading from request's data stream

I noted a user in the Slack support channel experiencing a nearly identical problem with a video task (4 labels are fine, the fifth throws this error) so perhaps it’s reproducible in other task types too: Slack Support Thread

My Setup
Version: 1.12.1
Installed via Docker and via PiP (Both experiences are the same)

labeling configuration:

<View>
    <Audio name="audio" value="$audio"/>
    <Labels name="label" toName="audio">
      <Label value="Speaker 1" background="#f500ff"/>
      <Label value="Speaker 2" background="#ff0300"/>
    </Labels>
   <TextArea  name="Transcript" toName="audio" perRegion="true" showSubmitButton="true" maxSubmissions="1" editable="true" required="true"/>                            
</View>