BIND 10 #2844: execute file fails with subnet options

[BIND 10 Development]

#2844: execute file fails with subnet options
-------------------------------------+-------------------------------------
            Reporter:  wlodekwencel  |                         Type:
              Status:  new           |  defect
           Milestone:  New Tasks     |                     Priority:
            Keywords:  bindctl,      |  medium
  execute file, subnet option        |                    Component:  bind-
           Sensitive:  0             |  ctl
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 I have config file:
 {{{
 config add Dhcp6/subnet6
 config set Dhcp6/subnet6[0]/subnet "3000::/64"
 config set Dhcp6/subnet6[0]/pool [ "3000::1-3000::ff" ]
 config commit

 config add Dhcp6/subnet6[0]/option-data
 config set Dhcp6/subnet6[0]/option-data[0]/name "preference"
 config set Dhcp6/subnet6[0]/option-data[0]/code 7
 config set Dhcp6/subnet6[0]/option-data[0]/space "dhcp6"
 config set Dhcp6/subnet6[0]/option-data[0]/csv-format true
 config set Dhcp6/subnet6[0]/option-data[0]/data "123"
 config commit
 }}}

 Entered directly works properly, but execute file fails with error:
 {{{
 Error:  No item 0 in subnet6[0]

 Depending on the contents of the script, and which
 commands it has called, there can be committed and
 local changes. It is advised to check your settings
 , and revert local changes with "config revert".
 }}}

 but when config is divided to two different files:
 first:
 {{{
 config add Dhcp6/subnet6
 config set Dhcp6/subnet6[0]/subnet "3000::/64"
 config set Dhcp6/subnet6[0]/pool [ "3000::1-3000::ff" ]
 config commit
 }}}
 second:
 {{{
 config add Dhcp6/subnet6[0]/option-data
 config set Dhcp6/subnet6[0]/option-data[0]/name "preference"
 config set Dhcp6/subnet6[0]/option-data[0]/code 7
 config set Dhcp6/subnet6[0]/option-data[0]/space "dhcp6"
 config set Dhcp6/subnet6[0]/option-data[0]/csv-format true
 config set Dhcp6/subnet6[0]/option-data[0]/data "123"
 config commit
 }}}
 then execute file works.

 There is no error with:
 config add Dhcp6/option-data (even with couple 'config commit' in it)
 only when applying option to specific subnet:
 config add Dhcp6/subnet6[0]/option-data

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Ticket URL: <http://bind10.isc.org/ticket/2844>
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BIND 10 Development