unknown warning from attributeDefinition

[YF Lai]

I made an attributeDefinition only available in c14/attribute resolution phase.  The definition worked as expected but it gave a warning of below that seems irrelevant.   Do you have any clue about this?

    <AttributeDefinition xsi:type="SubjectDerivedAttribute"
        forCanonicalization="true"
        id="azureName"
        principalAttributeName="azureName" />

    <AttributeDefinition id="canonicalNameToUseForJoin" xsi:type="ScriptedAttribute" resolutionPhases="c14n/attribute">
        <InputAttributeDefinition ref="azureName" />
        <Script><![CDATA[
        ...
        ]]></Script>
    </AttributeDefinition>

2022-05-17 21:06:46,964 -  - DEBUG [net.shibboleth.idp.attribute.resolver.ad.impl.ContextDerivedAttributeDefinition:137] - SubjectDerivedAttributeDefinition azureName Marked for use during canonicalication, auto-installing Subject lookup strategy
2022-05-17 21:06:46,970 -  - WARN [net.shibboleth.ext.spring.config.StringBooleanToPredicateConverter:52] - Unrecognized value 'c14n/attribute' converted to false; if intentional, explicitly use 'false'

Regards,
-YF
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