Jail MAC ADDRESS validation fails in "Advanced Jail Creation"

Mac Address validation fails when I try to create a Jail in Advanced Jail Creation, while the Jail is created in standard mode.

MAC prefix for both jail: f4ce46

Py Exception from Middleware and Iocage at console:

Error: Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/iocage_lib/ioc_create.py", line 495, in _create_jail
value, config = iocjson.json_check_prop(key, value, config)
File "/usr/local/lib/python3.7/site-packages/iocage_lib/ioc_json.py", line 2440, in json_check_prop
silent=self.silent
File "/usr/local/lib/python3.7/site-packages/iocage_lib/ioc_common.py", line 103, in logit
callback(content, exception)
File "/usr/local/lib/python3.7/site-packages/iocage_lib/ioc_common.py", line 76, in callback
raise callback_exception(message)
RuntimeError: Invalid mac_prefix. Must match `?X????` where ? can be any valid hex digit (0-9, A-F) and X is one of 2, 6, A or E.

During handling of the above exception, another exception occurred:

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 388, in __run_body
rv = await self.middleware.run_in_thread(self.method, *([self] + args))
File "/usr/local/lib/python3.7/site-packages/middlewared/utils/run_in_thread.py", line 10, in run_in_thread
return await self.loop.run_in_executor(self.run_in_thread_executor, functools.partial(method, *args, **kwargs))
File "/usr/local/lib/python3.7/site-packages/middlewared/utils/io_thread_pool_executor.py", line 25, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 965, in nf
return f(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/jail.py", line 771, in do_create
empty=empty
File "/usr/local/lib/python3.7/site-packages/iocage_lib/iocage.py", line 587, in create
clone_basejail=clone_basejail
File "/usr/local/lib/python3.7/site-packages/iocage_lib/ioc_create.py", line 100, in create_jail
return self._create_jail(jail_uuid, location)
File "/usr/local/lib/python3.7/site-packages/iocage_lib/ioc_create.py", line 501, in _create_jail
raise RuntimeError(f"**\n{err}\n**\n")
RuntimeError: ***
Invalid mac_prefix. Must match `?X????` where ? can be any valid hex digit (0-9, A-F) and X is one of 2, 6, A or E.

From iocage code in ioc_json.py:

elif key == 'mac_prefix':

1. Invalid letters - 0,1,3,4,5,7,8,9,B,C,D,F

2. Valid letters - 2,6,A,E
   if not self.validate_mac_prefix(value):
   iocage_lib.ioc_common.logit(
   {
   'level': 'EXCEPTION',
   'message': 'Invalid mac_prefix. Must match '
   '`?X????` where ? can be any '
   'valid hex digit (0-9, A-F) and '
   'X is one of 2, 6, A or E.'
   },
   _callback=self.callback,
   silent=self.silent
   )

So, f 4 ce46 won't match ? X ????

Workaround is easy... just choose a valid letter as second bit between 2, 6, A or E.