package <YOUR PACKAGE>;
...
public class FixedReplacingCompositeConverter<E> extends ReplacingCompositeConverter<E> {

    @Override
    public void setContext(Context context) {
        Converter childConverter = getChildConverter();
        if (childConverter instanceof ContextAware) {
            ((ContextAware) childConverter).setContext(context);
        }
        super.setContext(context);
    }
}

<configuration>
    
    <conversionRule conversionWord="replace" converterClass="<YOUR PACKAGE>.FixedReplacingCompositeConverter"/>

    <logger ...>
        <encoder>
             <pattern>%replace(%ex{full, org.springframework}){'\n', '|||'}%nopex</pattern>
        </encoder>
    </logger>

    ...
</configuration>