ForwardedRecordsParseMiddleware.handle() called the coroutine function
_send_loading_heartbeat() without awaiting it, so the coroutine was built
and dropped. The RUNNING heartbeat never reached the client and Python
raised "coroutine was never awaited".
Forwarded-record parsing is the slow inbound path, which is where the
loading bubble matters most: the user sees nothing while the deep parse
runs. Awaiting is safe, since the helper already swallows every exception
and the call sits inside the middleware's own try block.
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