Same SMB SIDs are assigned twice

BRIEF:

In TrueNAS-SCALE-21.08-BETA.1, some SIDs will be assigned to more than one object.

STEPS AND RESULTS:

Just for curiosity, I installed brand new TrueNAS-SCALE-21.08-BETA.1 on Proxmox VE and the all the settings are default.
This time I created group g1 in Credentials --> Local Groups , and user u1 in Credentials --> Local Users , then g2, u2, g3, u3 ...... (picture1/2)
All the groups and users are in the same settings (except names).
But as a result some users(u2 and u4) are obviously different from others: some of the SIDs which used to mark the group these users belong to are missing. ( picture3 )
AND it seems that the g2 and u2 use the same SID( S-1-5-21-xxx-1002), the same goes for g3 and u4(S-1-5-21-xxx-1004).
I am not an expert on the SMB protocol, but I really want to know if this is normal.

ACTUAL RESULT: some group use the same SID with user, and some user looks a little bit wierd.
EXPECTED RESULT: system don't assign same SID twice. all users are the same except for their names/SIDs.

SCREENSHOT / FAULT DETAILS:

ADDITIONAL INFO:

```

truenas# testparm
Load smb config files from /etc/smb4.conf
lpcfg_do_global_parameter: WARNING: The "syslog only" option is deprecated
Loaded services file OK.
Weak crypto is allowed

Server role: ROLE_STANDALONE

Press enter to see a dump of your service definitions

1. Global parameters
   [global]
   bind interfaces only = Yes
   disable spoolss = Yes
   dns proxy = No
   load printers = No
   logging = file
   max log size = 5120
   passdb backend = tdbsam:/root/samba/private/passdb.tdb
   printcap name = /dev/null
   registry shares = Yes
   restrict anonymous = 2
   server min protocol = SMB2
   server string = TrueNAS Server
   idmap config * : range = 90000001 - 100000000
   idmap config * : backend = tdb
   create mask = 0775
   directory mask = 0775
   truenas#

```

```

truenas# pdbedit -Lv
lpcfg_do_global_parameter: WARNING: The "syslog only" option is deprecated
---------------
Unix username: u2
NT username:
Account Flags: [U ]
User SID: S-1-5-21-709106821-3995303692-1386581790-1002
Primary Group SID: S-1-5-21-709106821-3995303692-1386581790-513
Full Name: u2
Home Directory: \\TRUENAS\u2
HomeDir Drive:
Logon Script:
Profile Path: \\TRUENAS\u2\profile
Domain: TRUENAS
Account desc:
Workstations:
Munged dial:
Logon time: 0
Logoff time: Wed, 06 Feb 2036 07:06:39 PST
Kickoff time: Wed, 06 Feb 2036 07:06:39 PST
Password last set: Fri, 01 Oct 2021 04:55:48 PDT
Password can change: Fri, 01 Oct 2021 04:55:48 PDT
Password must change: never
Last bad password : 0
Bad password count : 0
Logon hours : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
---------------
Unix username: u4
NT username:
Account Flags: [U ]
User SID: S-1-5-21-709106821-3995303692-1386581790-1004
Primary Group SID: S-1-5-21-709106821-3995303692-1386581790-513
Full Name: u4
Home Directory: \\TRUENAS\u4
HomeDir Drive:
Logon Script:
Profile Path: \\TRUENAS\u4\profile
Domain: TRUENAS
Account desc:
Workstations:
Munged dial:
Logon time: 0
Logoff time: Wed, 06 Feb 2036 07:06:39 PST
Kickoff time: Wed, 06 Feb 2036 07:06:39 PST
Password last set: Fri, 01 Oct 2021 05:20:40 PDT
Password can change: Fri, 01 Oct 2021 05:20:40 PDT
Password must change: never
Last bad password : 0
Bad password count : 0
Logon hours : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
---------------
Unix username: u1
NT username:
Account Flags: [U ]
User SID: S-1-5-21-709106821-3995303692-1386581790-1001
Primary Group SID: S-1-5-21-709106821-3995303692-1386581790-513
Full Name: u1
Home Directory: \\TRUENAS\u1
HomeDir Drive:
Logon Script:
Profile Path: \\TRUENAS\u1\profile
Domain: TRUENAS
Account desc:
Workstations:
Munged dial:
Logon time: 0
Logoff time: Wed, 06 Feb 2036 07:06:39 PST
Kickoff time: Wed, 06 Feb 2036 07:06:39 PST
Password last set: Fri, 01 Oct 2021 04:55:24 PDT
Password can change: Fri, 01 Oct 2021 04:55:24 PDT
Password must change: never
Last bad password : 0
Bad password count : 0
Logon hours : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
---------------
Unix username: u3
NT username:
Account Flags: [U ]
User SID: S-1-5-21-709106821-3995303692-1386581790-1003
Primary Group SID: S-1-5-21-709106821-3995303692-1386581790-513
Full Name: u3
Home Directory: \\TRUENAS\u3
HomeDir Drive:
Logon Script:
Profile Path: \\TRUENAS\u3\profile
Domain: TRUENAS
Account desc:
Workstations:
Munged dial:
Logon time: 0
Logoff time: Wed, 06 Feb 2036 07:06:39 PST
Kickoff time: Wed, 06 Feb 2036 07:06:39 PST
Password last set: Fri, 01 Oct 2021 04:58:12 PDT
Password can change: Fri, 01 Oct 2021 04:58:12 PDT
Password must change: never
Last bad password : 0
Bad password count : 0
Logon hours : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
truenas#

```