Page numbering not reinitialized after preface

In version 1.70.1, the page numbering is not reinitialized after preface in
fop output, contrary as what occured in version 1.69.1.

The culprit seems a missing preface in first.book.content in the
initial.page.number template:

<xsl:template name="initial.page.number">
<xsl:param name="element" select="local-name(.)"/>
<xsl:param name="master-reference" select="''"/>

<!-- Select the first content that the stylesheet places
after the TOC -->
<xsl:variable name="first.book.content"
select="ancestor::book/*[
not(self::title or
self::subtitle or
self::titleabbrev or
self::bookinfo or
self::info or
self::dedication or
self::toc or
self::lot
self::preface)][1]"/> <-- Addition -->
...