Imported Word Heading 4 Text Incorrectly Tagged with Color Style White
In the Word document below I have the Heading 4 text of "Double Range" and "Comparison". The former is correctly styled during conversion but the latter is somehow styled with color "white", making it hidden (against white background) in the resulting output.

Here's what the rendered HTML looks like in the RH2019 Classic topic pane:

Here's what the HTML source looks like in the RH2019 Classic topic pane (first the former heading and then the latter):
<h4 style="margin-left: 0cm; text-indent: 14.45pt;"><a name="b_Double_Range"
id="b_Double_Range"><span
style="color: #000000; font-weight: normal;">b)<span style="font: 7.0pt 'Times New Roman';">  </span></span> <span
style="color: #000000;">Double-Range</span></a></h4><h4 style="margin-left: 0cm;"><a name="c_Comparison" id="c_Comparison"><span
style="color: #000000; font-weight: normal;">c)<span style="font: 7.0pt 'Times New Roman';">  </span></span> <span
style="color: #ffffff;">Comparison</span></a></h4>And the final Response HTML 5 output:

I've looked closely at the original Word document Heading styles and text and haven't been able to decipher where the colour white is coming from. Anyone have any ideas on how to dissect the conversion more closely?
[Incidentally, a pandoc conversion to markdown for the original source Word document does not result in any differentiation in styling between these two headings...]

