[FS#3683] jsonfilter yields unreliable results (Attachment added)

[OpenWrt Bugs]

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User who did this - Arnold (arnysch) 

Attached to Project - OpenWrt/LEDE Project
Summary - jsonfilter yields unreliable results
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - - Device is an Arcadyan VGV7510KW22 (o2 Box 6431)
- Box software version is OpenWrt 19.07-SNAPSHOT, r11318-c64742a96e
- Problem shows up in package wireguard_tool which provides script wireguard_watchdog" which uses jsonfilter.
- Short steps to reproduce:

* Use attached file jinp1 as input and run this command:
    jsonfilter -a -e '@[@.proto="wireguard"].interface'   nothing is output (empty output), which is incorrect

* Now use attached file jinp2, which is jinp1 with lines slighty reordered:
    jsonfilter -a -e '@[@.proto="wireguard"].interface'   "wgvpn" is output, which is correct, this time.

- Background: Script wireguard_watchdog tries to identify the WireGuard network interfaces.
  To this end it runs these commands:
  ubus -S call network.interface dump | jsonfilter -e '@.interface[@.up=true]' | jsonfilter -a -e '@[@.proto="wireguard"].interface'
  The second jsonfilter call in this line erroneously does not show a result.
   The attached files jinp1, jinp2 contain example input for the 2nd jsonfilter call
 

One or more files have been attached.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3683

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