How to reproduce :

• On course or program, use filters with context type = all sites. For example

  <filter id="odf-news-1" target="content">
  		<context type="all-sites" lang="current"/>
  		<tags>
  			<tag key="ODF_NEWS_1"/>
  		</tags>
          <max-result>1</max-result>
          <content-types>
  		     <type id="org.ametys.web.default.Content.article"/>
  		</content-types>
          <view>main</view>       
      </filter>

• on preview, the value of ametys:skin() is wrong.