Hi,

I'm running some replication tasks using SSH with "Allow Blocks larger than 128k" enabled (which are unchangable after 11.3U5 update). Now I wanted to switch the task from SSH to SSH+Netcat but as soon as I change that the "Allow Blocks larger than 128k" isn't locked anymore and I can't save the changed task because I get the message:

[large_block] null not allowed

Error: 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 1084, in _call
return await methodobj(*args)
File "/usr/local/lib/python3.7/site-packages/middlewared/service.py", line 402, in update
f'{self._config.namespace}.update', self, self.do_update, [id, data]
File "/usr/local/lib/python3.7/site-packages/middlewared/main.py", line 1084, in _call
return await methodobj(*args)
File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 960, in nf
args, kwargs = clean_and_validate_args(args, kwargs)
File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 918, in clean_and_validate_args
value = attr.clean(args[args_index + i])
File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 594, in clean
data[key] = attr.clean(value)
File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 370, in clean
value = super().clean(value)
File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 76, in clean
raise Error(self.name, 'null not allowed')
middlewared.schema.Error: [large_block] null not allowed

It happens if I dont touch, set or unset the "Allow Blocks larger than 128k". Looks like a UI bug caused by the 11.3u5 update