DOCX table caption to Markdown has extra "Table" word

[rgaiacs]

Given the minimal DOCX working example that has

pandoc --from docx --to markdown caption.docx produces

-----------------------------------------------------------------------
Foo                                 Bar
----------------------------------- -----------------------------------
1                                   2

-----------------------------------------------------------------------

: Table Caption here.

Note the Table after : that is different with table_captions:

A caption is a paragraph beginning with the string Table: (or table: or just :), which will be stripped off.

The expected output is

-----------------------------------------------------------------------
Foo                                 Bar
----------------------------------- -----------------------------------
1                                   2

-----------------------------------------------------------------------

: Caption here.

When inspecting the XML generated by Pandoc and Microsoft Office Word, they are very different.

Pandoc XML:

<w:p>
    <w:pPr>
    <w:pStyle w:val="TableCaption"/>
    </w:pPr>
    <w:r>
    <w:t xml:space="preserve">Caption here.</w:t>
    </w:r>
</w:p>

Microsoft Office Word XML:

<w:p w14:paraId="5AD17E4F" w14:textId="3DEE5416" w:rsidR="00C10DAE" w:rsidRDefault="00C10DAE" w:rsidP="00C10DAE">
    <w:pPr>
      <w:pStyle w:val="Caption"/>
      <w:keepNext/>
    </w:pPr>
    <w:r>
      <w:t xml:space="preserve">Table </w:t>
    </w:r>
    <w:fldSimple w:instr=" SEQ Table \* ARABIC ">
      <w:r>
        <w:rPr>
          <w:noProof/>
        </w:rPr>
        <w:t>1</w:t>
      </w:r>
    </w:fldSimple>
    <w:r>
      <w:t xml:space="preserve"> </w:t>
    </w:r>
    <w:r w:rsidR="00D62831">
      <w:t>C</w:t>
    </w:r>
    <w:r>
      <w:t>aption here.</w:t>
    </w:r>
</w:p>

Environment:

pandoc 3.1.5
Features: +server +lua
Scripting engine: Lua 5.4

[jgm]

We should presumably strip off everything before <w:fldSimple w:instr=" SEQ Table ... in the caption.