[xep-support] Hyphenation character not being displayed?

Hi there,

While preparing PDF's of the Boost C++ libraries for release I'm having
problems getting a Unicode hyphenation character to display: I'm trying to
enable line-wrapping and hyphenation in a C++ code block, so that character
↵ (carriage return symbol) is used as a hyphenation character - I can
get this character to display OK in a regular text block, but in monospace
text I see nothing showing up at all (not even a square "character not
found" block).

In contrast if I use a regular ASCII character such as '\' as the
hyphenation character then it does show up OK.

The block starts something like this:

<fo:block id="id742525" border-color="#DCDCDC" border-width="1px"
border-style="solid" padding-left="0.2cm" padding-right="0.2cm"
padding-top="0.2cm" padding-bottom="0.2cm" widows="6" orphans="40"
font-size="9pt" hyphenate="true" wrap-option="wrap"
hyphenation-character="&#x21B5;" text-align="start"
space-before.minimum="0.8em" space-before.optimum="1em"
space-before.maximum="1.2em" space-after.minimum="0.8em"
space-after.optimum="1em" space-after.maximum="1.2em"
white-space-collapse="false" white-space-treatment="preserve"
linefeed-treatment="preserve" font-family="monospace">

I'm attaching the complete FO file as well: unfortunately since it's machine
generated from DocBook there's quite a bit of "chaff" in there :-(

Is this a bug, or am I doing something wrong here?

Many thanks, John Maddock.

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