Missing Permissions in ZFS Pool

[五河琴里]

Hello, I found out there are missing permission in the zfs pool. Problematic permissions are:
- No write permission at the root directory of the pool.
- Cannot create new dataset at the root directory. Newly created dataset is listed in the Storage tab but not mounted and unable to be mounted.(Operation not permitted)

Show

Code:

Error: concurrent.futures.process._RemoteTraceback:
"""
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/middlewared/plugins/zfs.py", line 927, in mount
    dataset.mount()
  File "libzfs.pyx", line 404, in libzfs.ZFS.__exit__
  File "/usr/lib/python3/dist-packages/middlewared/plugins/zfs.py", line 927, in mount
    dataset.mount()
  File "libzfs.pyx", line 3812, in libzfs.ZFSDataset.mount
libzfs.ZFSException: failed to create mountpoint: Operation not permitted

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.9/concurrent/futures/process.py", line 243, in _process_worker
    r = call_item.fn(*call_item.args, **call_item.kwargs)
  File "/usr/lib/python3/dist-packages/middlewared/worker.py", line 114, in main_worker
    res = MIDDLEWARE._run(*call_args)
  File "/usr/lib/python3/dist-packages/middlewared/worker.py", line 45, in _run
    return self._call(name, serviceobj, methodobj, args, job=job)
  File "/usr/lib/python3/dist-packages/middlewared/worker.py", line 39, in _call
    return methodobj(*params)
  File "/usr/lib/python3/dist-packages/middlewared/worker.py", line 39, in _call
    return methodobj(*params)
  File "/usr/lib/python3/dist-packages/middlewared/schema.py", line 1265, in nf
    return func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/middlewared/plugins/zfs.py", line 930, in mount
    raise CallError(f'Failed to mount dataset: {e}')
middlewared.service_exception.CallError: [EFAULT] Failed to mount dataset: failed to create mountpoint: Operation not permitted
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 175, in call_method
    result = await self.middleware._call(message['method'], serviceobj, methodobj, params, app=self)
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1257, in _call
    return await methodobj(*prepared_call.args)
  File "/usr/lib/python3/dist-packages/middlewared/service.py", line 920, in create
    rv = await self.middleware._call(
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1257, in _call
    return await methodobj(*prepared_call.args)
  File "/usr/lib/python3/dist-packages/middlewared/schema.py", line 1129, in nf
    res = await f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/middlewared/schema.py", line 1261, in nf
    return await func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/middlewared/plugins/pool.py", line 3316, in do_create
    await self.middleware.call('zfs.dataset.mount', data['name'])
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1308, in call
    return await self._call(
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1265, in _call
    return await self._call_worker(name, *prepared_call.args)
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1271, in _call_worker
    return await self.run_in_proc(main_worker, name, args, job)
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1186, in run_in_proc
    return await self.run_in_executor(self.__procpool, method, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/middlewared/main.py", line 1169, in run_in_executor
    return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
middlewared.service_exception.CallError: [EFAULT] Failed to mount dataset: failed to create mountpoint: Operation not permitted

- No R/W permission in some of the datasets. (Can't see any file on that dataset, just an empty directory, but it still occupies the disk space according to the "Storage" tab)

Any idea what could be causing this problem?

Thank you very much.