Table Header not imported

Sorry, we do not understand your remark. The source code in the wiki is the above mentioned. As it is the company wiki, we cannot post the content.

we are using the following software: bluespice 3.2.6 from 2021-09-16 which is based on Mediawiki., probably 1.35 LTS.
xwiki 17.3.0,  MediaWiki XML 2.1.0 ,  Filter Streams Converter Application 17.2.2 

Maybe you mean the xml code? for the table page the xml-export looks like this:

<mediawiki xmlns="http://www.mediawiki.org/xml/export-0.10/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mediawiki.org/xml/export-0.10/ http://www.mediawiki.org/xml/export-0.10.xsd" version="0.10" xml:lang="en">
  <siteinfo>
    <dbname>bluespice</dbname>
    <base></base>
    <generator>MediaWiki 1.31.15</generator>
    <case>first-letter</case>
    <namespaces>
      <namespace key="-2" case="case-sensitive">Media</namespace>
      <namespace key="-1" case="first-letter">Special</namespace>
      <namespace key="0" case="first-letter" />
      <namespace key="1" case="first-letter">Talk</namespace>
      <namespace key="2" case="first-letter">User</namespace>
      <namespace key="3" case="first-letter">User talk</namespace>
      <namespace key="4" case="first-letter">Project</namespace>
      <namespace key="5" case="first-letter">Project talk</namespace>
      <namespace key="6" case="case-sensitive">File</namespace>
      <namespace key="7" case="case-sensitive">File talk</namespace>
      <namespace key="8" case="first-letter">MediaWiki</namespace>
      <namespace key="9" case="first-letter">MediaWiki talk</namespace>
      <namespace key="10" case="first-letter">Template</namespace>
      <namespace key="11" case="first-letter">Template talk</namespace>
      <namespace key="12" case="first-letter">Help</namespace>
      <namespace key="13" case="first-letter">Help talk</namespace>
      <namespace key="14" case="first-letter">Category</namespace>
      <namespace key="15" case="first-letter">Category talk</namespace>
      <namespace key="2300" case="first-letter">Gadget</namespace>
      <namespace key="2301" case="first-letter">Gadget talk</namespace>
      <namespace key="2302" case="case-sensitive">Gadget definition</namespace>
      <namespace key="2303" case="case-sensitive">Gadget definition talk</namespace>
    </namespaces>
  </siteinfo>
  <page>
    <title></title>
     <model>wikitext</model>
      <format>text/x-wiki</format>
      <text xml:space="preserve" bytes="4769">
      some text here
 

      </text>
  </page>
</mediawiki>