[Typo3] <LINK> is not converted to <a> using FlexForms and htmlarea with css_styled_content

[franz ripfel]

Hi,

I am using version 3.7 with htmlarea and flexforms and css_styled_content.
I created a flexform including an RTE-field.
In the backend everything is fine, but the <link>-Tags are not converted  
to <a>-Tags while rendering the content for the frontend.

After searching the list i got the configuration below, but still <link>  
is not converted.
What did i miss? Any suggestions?

Probably i need to set some content rendering flags in TSConfig?
Or should i include some TypoScript to render that content?

I also tried to use the transformation filter ts_reglinks, but there was  
still <LINK> saved to the DB.

Thanks for your help!
Franz

My XML Data Structure:
             <field_teasertext type="array">
                 <tx_templavoila type="array">
                     <title>Teasertext</title>
                     <description>teasertext</description>
                     <sample_data type="array">
                         <numIndex index="0">[...teasertext...]</numIndex>
                     </sample_data>
                     <eType>text</eType>
                     <tags>*:inner</tags>
                     <proc type="array">
                         <HSC type="integer">0</HSC>
                     </proc>
                 </tx_templavoila>
                 <TCEforms type="array">
                     <config type="array">
                         <type>text</type>
                         <cols>48</cols>
                         <rows>5</rows>
                     </config>
                     <label>Teasertext</label>
                     <defaultExtras>richtext[*]:rte_transform[mode=ts_css]</defaultExtras>
                 </TCEforms>
             </field_teasertext>

My Data from tt_content for that field:
<?xml version="1.0" encoding="iso-8859-1" standalone="yes" ?>
<T3FlexForms>
     <data type="array">
         <sDEF type="array">
             <lDEF type="array">
                 <field_image type="array">
                     <vDEF></vDEF>
                 </field_image>
                 <field_headline type="array">
                     <vDEF>asdfasdf</vDEF>
                 </field_headline>
                 <field_teasertext type="array">
                     <vDEF>asdfasdf&lt;b&gt;asdfsadf asdfsadf&lt;/b&gt; sss
&lt;p align=&quot;right&quot;&gt;&lt;LINK  
260&gt;myLink&lt;/LINK&gt;&lt;br&gt;&lt;/p&gt;</vDEF>
                 </field_teasertext>
             </lDEF>
         </sDEF>
     </data>
</T3FlexForms>