Some minus signs get dropped partway through pipeline
When converting a Word document to HTML that has many equations, I noticed that some of the minus signs were missing in HTML. Most of the missing characters are present through step 11 of the pipeline. (One negative sign was missing in all .xhtml files, so it might represent a different issue entirely.)
I'm attaching a .docx file and two .xhtml files. (The .docx file is excerpted from a document authored by someone other than me, and I haven't looked carefully at the styles or character usage.) The step 11 .xhtml file represents the Word document well, except one missing negative sign. The step 12 .xhtml file is missing several minus signs.