Upgrade pending never appears

To reproduce:

1.) Start with a working 11.3-U3 (latest internal built 04-28-2020) TrueNAS HA

2.) Upgrade the first controller

3.) Failover to 12.0

The upgrade cannot be completed because pending upgrade never appears.

tn-bhyve01-nodeb# midclt call failover.upgrade_pending
False

root@tn-bhyve01-nodea[~]# midclt call failover.upgrade_pending
[EFAULT] Upgrade can only be run from the Active Controller.
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/middlewared/main.py" , line 130, in call_method
io_thread=False)
File "/usr/local/lib/python3.7/site-packages/middlewared/main.py" , line 1096, in _call
return await run_method(methodobj, *args)
File "/usr/local/lib/python3.7/site-packages/middlewared/main.py" , line 1020, in _run_in_conn_threadpool
return await self.run_in_executor(self.__ws_threadpool, method, *args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/middlewared/main.py" , line 1008, in run_in_executor
return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
File "/usr/local/lib/python3.7/concurrent/futures/thread.py" , line 57, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py" , line 965, in nf
return f(*args, **kwargs)
File "/usr/local/lib/middlewared_truenas/plugins/failover.py" , line 894, in upgrade_pending
raise CallError( 'Upgrade can only be run from the Active Controller.' )
middlewared.service_exception.CallError: [EFAULT] Upgrade can only be run from the Active Controller.