The new version of Coder - 3.7 - dropped the Drupal.WhiteSpace.OperatorSpacing
in #3082623: Is it still necessary to override OperatorSpacingSniff? however it is still used in phpcs.xml.dist
by core.
Proposed resolution
Replace:
<rule ref="Drupal.WhiteSpace.OperatorSpacing"/>
by:
<rule ref="Squiz.WhiteSpace.OperatorSpacing">
<properties>
<property name="ignoreNewlines" value="true"/>
</properties>
</rule>