How to reproduce : 

• Open Content Type Editor
• Open "Candidat" node (it is opened in the right panel) 
• Select "Attributs/Commentaire" and click on "Attributs/Modifier". 
• Pop-up is opened for update. Do nothing and click on "Terminate" button. 
• Save updates in the ribbon

=>  In WEB-INF/param/contenttypes/_override folder, a file is created for Candidat, and "Comment" field is seen as updated whereas it is not the case. 

 
<?xml version="1.0" encoding="UTF-8"?><cms:content-type xmlns:cms="
http://www.ametys.org/schema/cms
">
<cms:metadata name="comment" multiple="false" type="string">
<cms:label i18n="true">plugin.cms:PLUGINS_CMS_HIERARCHICAL_REFERENCE_TABLES_CANDIDATE_COMMENT_LABEL</cms:label>
<cms:description i18n="true">plugin.cms:PLUGINS_CMS_HIERARCHICAL_REFERENCE_TABLES_CANDIDATE_COMMENT_LABEL</cms:description>
<widget-params/>
</cms:metadata>
<cms:metadata-set name="main" type="view" internal="false">
<cms:label i18n="false">main</cms:label>
<cms:description i18n="false"/>
<cms:metadata-ref name="comment"/>
</cms:metadata-set>
<cms:metadata-set name="creation" type="view" internal="false">
<cms:label i18n="false">creation</cms:label>
<cms:description i18n="false"/>
<cms:metadata-ref name="comment"/>
</cms:metadata-set>
<cms:metadata-set name="details" type="view" internal="false">
<cms:label i18n="false">details</cms:label>
<cms:description i18n="false"/>
<cms:metadata-ref name="comment"/>
</cms:metadata-set>
</cms:content-type>