Converting from docbook to LaTeX I came across a possible uncorrect management of U+200B when converting to LaTeX.
The following docbook MWE (the simple string "...abc")
<?xml version="1.0" encoding="UTF-8"?>
<?asciidoc-toc?>
<?asciidoc-numbered?>
<article xmlns="http://docbook.org/ns/docbook" xmlns:xl="http://www.w3.org/1999/xlink" version="5.0" xml:lang="en">
<simpara>…​abc</simpara>
is converted to LaTeX
with a (invisible but detectable in the real output) zero-width-space between "\ldots" and "abc".
I think that the correct LaTeX output should be
with a standard space after `\ldots`, because if you try to produce a PDF you get
[WARNING] Missing character: There is no ÔÇï (U+200B) in font [lmroman10-regular]:mapping=tex-text;!
because of the presence of the zero-width-space, whereas with the standard space you get the correct output ("...abc" and not "... abc") in PDF (and no warnings).