Cloud Sync to Backblaze B2 fails

I have a Cloud Sync setup to BackBlaze B2. It's about 4.5GB in size. Snapshot was not enabled.

The task seems to run forever.

Checking /tmp/middleward/jobs/ the last file sync'd is over over 12 hours ago.

When I clicked on the RUNNING label under Tasks > Cloud Sync it showed the attached image for over 10 minutes so the task appeared to be stuck.

I stopped the task and got this error:

Error: Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/middlewared/job.py", line 349, in run
await self.future
File "/usr/local/lib/python3.7/site-packages/middlewared/job.py", line 386, in __run_body
rv = await self.method(*([self] + args))
File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 961, in nf
return await f(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/cloud_sync.py", line 1007, in sync
await rclone(self.middleware, job, cloud_sync)
File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/cloud_sync.py", line 218, in rclone
await asyncio.wait_for(check_cloud_sync, None)
File "/usr/local/lib/python3.7/asyncio/tasks.py", line 414, in wait_for
return await fut
File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/cloud_sync.py", line 377, in rclone_check_progress
read = (await proc.stdout.readline()).decode()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa0 in position 112: invalid start byte

I looked through /var/log/middlewared.log and could only find the entry where rclone starts and no errors after that.