When you look in share\registry\data\org\openoffice\Office\Linguistic.xcu the
entries for the Hyphenator list look like:

  <node oor:name="HyphenatorList">
   <prop oor:name="da-DK" oor:op="replace" oor:type="oor:string-list">
    <value>org.openoffice.lingu.LibHnjHyphenator</value>
   </prop>

The type has to be   oor:type="xs:string"  for the HyphenatorList and for the
HyphenatorList only (the list for the spell checker and thesaurus are correct!)

The mismatch causes a parsing error in the configuration and in the final
consequence an invalid configuration item. Thus all property values on that item
are often incorrect and won't get saved or loaded correctly.