The following log messages are seen in production, related to the parent task:
[ ]
```
Use of Article::exists was deprecated in MediaWiki 1.35. [Called from LqtHooks::editCheckboxes in /srv/mediawiki/php-1.35.0-wmf.30/extensions/LiquidThreads/classes/Hooks.php at line 336]
```
[x]
```
Use of Article::exists was deprecated in MediaWiki 1.35. [Called from WikiEditorHooks::editPageShowEditFormInitial in /srv/mediawiki/php-1.35.0-wmf.30/extensions/WikiEditor/includes/WikiEditorHooks.php at line 109]
```
[ ]
```
Use of Article::getId was deprecated in MediaWiki 1.35. [Called from Threads::withRoot in /srv/mediawiki/php-1.35.0-wmf.30/extensions/LiquidThreads/classes/Threads.php at line 154]
```
[ ]
```
Use of Article::exists was deprecated in MediaWiki 1.35. [Called from Thread::article in /srv/mediawiki/php-1.35.0-wmf.30/extensions/LiquidThreads/classes/Thread.php at line 1281]
```
[ ]
```
Use of Article::getTimestamp was deprecated in MediaWiki 1.35. [Called from LqtView::threadInfoPanel in /srv/mediawiki/php-1.35.0-wmf.30/extensions/LiquidThreads/classes/View.php at line 1624]
```
All of these seem to belong to either LiquidThreads or WikiEditor extension. Patches need to be made for each to fix the deprecations. Patches has to be as small as possible.