Error
MediaWiki version: 1.35.0-wmf.31
$row does not contain fields needed for comment rev_comment
Impact
A couple of these in 1.35.0-wmf.31.
Notes
Tagging @DannyS712 as I'm guessing this is fallout from Revision refactoring.
Caused by 49707c59da2c4776b7752a5f2d5710f772c8d541