kauth_cred_getgroups() changes?

Having issues calling kauth_cred_getgroups() as non-root cred_t from BigSur. Get panic:

Code Block 0xffffffa843a737b0 : 0x0
0xffffffa843a738e0 : 0xffffff7fa5ab889e net.lundman.zfs : _dsl_load_user_sets + 0xbe
-> 126 		ret = kauth_cred_getgroups((kauth_cred_t)cr, gids, &count);

Code Block
0xffffffa843a737b0 : 0x0
0xffffffa843a738e0 : 0xffffff7fa5ab889e net.lundman.zfs : _dsl_load_user_sets + 0xbe

-> 126 ret = kauth_cred_getgroups((kauth_cred_t)cr, gids, &count);

I see nothing suspicious with the arguments either:

Code Block (lldb) p *cr
(cred_t) $4 = {
  cr_link = {
    le_next = 0xffffff868f0ac370
    le_prev = 0xffffff80056582d0
  }
  cr_ref = 52
  cr_posix = {
    cr_uid = 501
    cr_ruid = 501
    cr_svuid = 501
    cr_ngroups = 16
    cr_groups = {
      [0] = 20
      [1] = 12
      [2] = 61
      [3] = 79
      [4] = 80
      [5] = 81
      [6] = 98
      [7] = 701
      [8] = 33
      [9] = 100
      [10] = 204
      [11] = 250
      [12] = 395
      [13] = 398
      [14] = 399
      [15] = 400
    }
    cr_rgid = 20
    cr_svgid = 20
    cr_gmuid = 501
    cr_flags = 2
  }
  cr_label = 0xffffff868fdb41c0
  cr_audit = {
    as_aia_p = 0xffffff934aef0a18
    as_mask = (am_success = 12288, am_failure = 12288)
  }
}
(lldb) p gids
(gid_t [16]) $1 = {
  [0] = 0
  [1] = 0
  [2] = 0
  [3] = 0
  [4] = 0
  [5] = 0
  [6] = 0
  [7] = 0
  [8] = 0
  [9] = 0
  [10] = 0
  [11] = 0
  [12] = 0
  [13] = 0
  [14] = 0
  [15] = 0
}
(lldb) p count
(int) $2 = 16

Code Block
(lldb) p *cr
(cred_t) $4 = {
cr_link = {
le_next = 0xffffff868f0ac370
le_prev = 0xffffff80056582d0
}
cr_ref = 52
cr_posix = {
cr_uid = 501
cr_ruid = 501
cr_svuid = 501
cr_ngroups = 16
cr_groups = {
[0] = 20
[1] = 12
[2] = 61
[3] = 79
[4] = 80
[5] = 81
[6] = 98
[7] = 701
[8] = 33
[9] = 100
[10] = 204
[11] = 250
[12] = 395
[13] = 398
[14] = 399
[15] = 400
}
cr_rgid = 20
cr_svgid = 20
cr_gmuid = 501
cr_flags = 2
}
cr_label = 0xffffff868fdb41c0
cr_audit = {
as_aia_p = 0xffffff934aef0a18
as_mask = (am_success = 12288, am_failure = 12288)
}
}

(lldb) p gids
(gid_t [16]) $1 = {
[0] = 0
[1] = 0
[2] = 0
[3] = 0
[4] = 0
[5] = 0
[6] = 0
[7] = 0
[8] = 0
[9] = 0
[10] = 0
[11] = 0
[12] = 0
[13] = 0
[14] = 0
[15] = 0
}
(lldb) p count
(int) $2 = 16

Works every time if I am root, but will panic as non-root. Stack having NULL is also odd. Runs on Catalina and before.