What is TLF support for diacritical marks in Hebrew?

I have started a right-to-left  language using TextFlow and RichEditableText.

I have trouble with  kerning.

When  using Hebrew with diacritical marks (and these are common), the kerning  is not correct.  Each diacritical glyph is made in a space after the  character.  (This did work with TextField).  I tried setting Kerning ON,  but that did not help.

I am ready to select a font family that works, but I'd like it to be fairly "formal" (like DavidD).

typical code:

           
             var format:TextLayoutFormat;
            textFlow =  TextFlowUtil.importFromXML(textFlowXML, WhiteSpaceCollapse.PRESERVE);
            
            format = new TextLayoutFormat();
             format.color = 0x442222;
            format.kerning =  flash.text.engine.Kerning.ON;
           
             textFlow.format = format;

            richText.textFlow = textFlow;

The XML  (just the start - close the span and other elements):

   <TextFlow direction="rtl">
    <div color="#442222"  fontSize="20" paragraphSpaceAfter="0" textAlign="right"  fontFamily="DavidD" >
      <p name="p0"><span>פרק  א</span></p>
      <p>     
      <span>
א   בְּרֵאשִׁית בָּרָא אֱלֹהִים אֵת הַשָּׁמַיִם וְאֵת הָאָרֶץ