Error
MediaWiki version: 1.36.0-wmf.33
User::loadFromSession called before the end of Setup.php
Impact
Not sure.
This is triggered also by GET to regular wiki pages – it's not something specific to this gadget or action=raw AFAICT
Notes
First seen on March 3, so an issue introduced in T274937: 1.36.0-wmf.33 deployment blockers, and there have been 36,045 of these errors logged so far.