pyo3_runtime.PanicException: called Result::unwrap() on an Err value: UnexpectedValue

[assoly-lab]

Description

am not really sure if this is a bug or a mistake by me.

i created a websocket consumer that broadcast received updates from the frontend (NextJS with tiptapJS and HocusPocus provider) to connected clients using the consumer example (django_channels_consumer.YjsConsumer).
inside receive function
this condition is always true since the first byte of the received payload is never 0 or 1, therefore the server Ydoc file stays empty.

if bytes_data[0] != YMessageType.SYNC:
            return

but when i try to apply the received payload directly to Doc,

self.ydoc.apply_update(bytes_data)

i get this error.

File "D:\WebDevelopement\PortfolioProjects\Collaboration Tool\BackEnd\venv\Lib\site-packages\pycrdt_websocket\django_channels_consumer.py", line 182, in receive
    self.ydoc.apply_update(bytes_data)
  File "D:\WebDevelopement\PortfolioProjects\Collaboration Tool\BackEnd\venv\Lib\site-packages\pycrdt\_doc.py", line 166, in apply_update
    self._doc.apply_update(txn._txn, update)
pyo3_runtime.PanicException: called `Result::unwrap()` on an `Err` value: UnexpectedValue

am i doing something wrong, or is it that the received bytes need some processing before applied.

Reproduce

just apply the received bytes directly to ydoc

async def receive(self,text_data=None, bytes_data=None):
    if bytes_data is not None:
        self.ydoc.apply_update(bytes_data)
    

I can try to make an isolated repro if necessary.