Change 577019 runs a new structure tests that detects conflicts in InitialiseSettings.php where the same setting uses multiple dblists to set values that are different.
This test detected a conflict in wmgUseGlobalAbuseFilters where the following tags overlap and are fighthing for incompatible configuration values:
'wmgUseGlobalAbuseFilters' => [ 'fishbowl' => false 'medium' => true 'small' => true 'nonglobal' => false 'private' => false ]
The default in wmf-config for this variable is 'default' => false,. Please decide which groups it should be enabled on and set only those (per-wiki overrides are fine, but there cannot be overrides between groups as there is no order of precedence defined).
To see which order the run-time currently uses internally see MWConfigCacheGenerator.php.