Replication that worked in 11.3-U4 and 12.0-Beta2 fails in 12.0-RC1

Replication that worked in 11.3-U4 and 12.0-Beta2 fails in 12.0-RC1 with the following error: "SshReplicationProcess' object has no attribute 'stop_progress_observer"
I tried making minor modification to the job and saving it to see that would change any thing and it did not.

Below is the console log and I also attached a debug.

Sep 17 02:00:02 moya 1 2020-09-17T02:00:02.322480-05:00 moya.jkhfamily.net /middlewared 320 - - [middlewared.job:373] Job <bound method accepts.<locals>.wrap.<locals>.nf of <middlewared.plugins.replication.ReplicationService object at 0x81cb2ca60>> failed
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/middlewared/job.py", line 361, in run
await self.future
File "/usr/local/lib/python3.8/site-packages/middlewared/job.py", line 397, in __run_body
rv = await self.method(*([self] + args))
File "/usr/local/lib/python3.8/site-packages/middlewared/schema.py", line 973, in nf
return await f(*args, **kwargs)
File "/usr/local/lib/python3.8/site-packages/middlewared/plugins/replication.py", line 427, in run
await self.middleware.call("zettarepl.run_replication_task", id, really_run, job)
File "/usr/local/lib/python3.8/site-packages/middlewared/main.py", line 1233, in call
return await self._call(
File "/usr/local/lib/python3.8/site-packages/middlewared/main.py", line 1202, in _
Sep 17 02:00:02 moya 1 2020-09-17T02:00:02.322546-05:00 moya.jkhfamily.net /middlewared 320 - - call
return await self.run_in_executor(prepared_call.executor, methodobj, *prepared_call.args)
File "/usr/local/lib/python3.8/site-packages/middlewared/main.py", line 1106, in run_in_executor
return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
File "/usr/local/lib/python3.8/site-packages/middlewared/utils/io_thread_pool_executor.py", line 25, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/local/lib/python3.8/site-packages/middlewared/plugins/zettarepl.py", line 369, in run_replication_task
raise CallError(make_sentence(message.error))
middlewared.service_exception.CallError: [EFAULT] 'SshReplicationProcess' object has no attribute 'stop_progress_observer'.