Deprecated: Use of BaseTemplate::getToolbox was deprecated in MediaWiki 1.35.
You'll likely hit this error in wikis using 1.35: AetherTemplate::renderPortals in /Users/jrobson/git/core/skins/Aether/AetherTemplate.php at line 352]
The replacement method is $this->get('sidebar')['TOOLBOX']
If you need to support older versions, you may want to check the value of that first and fallback to $this->getToolbox()
if not available.
Let me know if I can help with anything here!