The moodle-extra rule set seems to have a rule that conflicts with moodle-plugin-ci.
The moodle-extra rules set has: The first expression of a multi-line control structure must be on the line after the opening parenthesis
moodle-plugin-ci has: Whitespace found after opening bracket of FOR loop (Squiz.ControlStructures.ForLoopDeclaration.SpacingAfterOpen)