JSONPath tool: null value makes `$..*[?@.test]` both valid and invalid

[Stevoisiak]

Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is NOT a YouTube, Facebook or Twitch report. These sites MUST be reported by clicking their respective links.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

In the JSONPath tool, if the JSON has data with a null value, the expression $..*[?@.test] or v2:$..*[?@.test] will not update the result list. Instead, it will continue showing the result for the previously entered expression.

A specific URL where the issue occurs.

http://localhost:8000/tools/jsonpath-tool.html

Steps to Reproduce

1. Run and load the JSONPath tool.
2. Enter the following JSON.

{
  "body": {
    "test": null
  }
}

3. For the expression, enter $..[?@.test], then enter $..*[?@.test].
4. For the expression, enter $..**[?@.test], then enter $..*[?@.test].

Expected behavior

The same result should always be shown when entering $..*[?@.test].

Troubleshooting information

uBlock Origin: 1.72.0
Chromium: 149
filterset (summary):
 network: 183539
 cosmetic: 92382
 scriptlet: 46635
 html: 0
listset (total-discarded, last-updated):
 added:
  fanboy-cookiemonster: 46965-120, 4d.17h.42m
  ublock-cookies-easylist: 5706-45, 4d.17h.42m
  easylist-newsletters: 9377-17, 4d.17h.42m
  ublock-experimental: 11-0, 2h.33m Δ
 default:
  user-filters: 3-0, never
  ublock-filters: 51786-86, 2h.33m Δ
  ublock-badware: 10244-27, 2h.33m Δ
  ublock-privacy: 4068-3, 2h.33m Δ
  ublock-unbreak: 2771-1, 2h.33m Δ
  ublock-quick-fixes: 468-0, 2h.33m Δ
  easylist: 84720-477, 2h.33m Δ
  easyprivacy: 55913-712, 2h.33m Δ
  urlhaus-1: 48650-11, 7h.33m
  plowe-0: 3504-2, 11d.18h.4m
filterset (user): [array of 3 redacted]
trustedset:
 added: [array of 12 redacted]
 removed:
  chrome-extension-scheme
switchRuleset:
 added: [array of 4 redacted]
userSettings:
 advancedUserEnabled: true
 userFiltersTrusted: true
hiddenSettings:
 trustedListPrefixes: ublock- https://raw.githubusercontent.com/Stevoisiak/Stevos-GenAI-Blocklist/refs/heads/main/GenAI-Blocklist.txt
supportStats:
 allReadyAfter: 879 ms (selfie)
 maxAssetCacheWait: 350 ms
 cacheBackend: indexedDB

[Stevoisiak]

Found another expression v2:$.body[.test that can register as both valid and invalid.

Seems to be caused by unclosed brackets followed by a period