Upgrade From CORE 12.0-U8 to SCALE 22.02 RELEASE Fails - freenas-boot/grub Dataset Exists

Issue documented originally in the forumes here .

Failed during post install tasks

Error: Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 367, in run
await self.future
File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 403, in __run_body
rv = await self.method(*([self] + args))
File "/usr/local/lib/python3.9/site-packages/middlewared/schema.py", line 975, in nf
return await f(*args, **kwargs)
File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/update.py", line 389, in file
await self.middleware.call('update.install_manual_impl', job, destfile, dest_extracted)
File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1256, in call
return await self._call(
File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1224, in _call
return await self.run_in_executor(prepared_call.executor, methodobj, *prepared_call.args)
File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1128, in run_in_executor
return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
File "/usr/local/lib/python3.9/concurrent/futures/thread.py", line 52, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/update_/install_freebsd.py", line 53, in install_manual_impl
return self._install_scale(job, path)
File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/update_/install_freebsd.py", line 73, in _install_scale
return self.middleware.call_sync(
File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1283, in call_sync
return methodobj(*prepared_call.args)
File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/update_/install.py", line 69, in install_scale
raise CallError(error)
middlewared.service_exception.CallError: [EFAULT] Command ['zfs', 'create', '-o', 'mountpoint=legacy', 'freenas-boot/grub'] failed with exit code 1: cannot create 'freenas-boot/grub': dataset already exists

System is sitting at the error ... will not do anything else.