TOC generation stopped after moving to stylesheet version 1.75.1

I was using 1.71.1 with the following customizations. Now I get an empty
TOC with version 1.75.1. This happens only in the HTML output. Works
fine with PDF. I can also confirm that switching back to 1.71.1 restores
the TOC. Any clues?

  <xsl:param name="section.autolabel" select="'1'"/>
  <xsl:param name="section.autolabel.max.depth" select="'3'"/>
  <xsl:param name="section.label.includes.component.label" select="'1'"/>
  <xsl:param name="use.extensions" select="'0'"/>
  <xsl:param name="fop.extensions" select="'0'"/>
  <xsl:param name="fop1.extensions" select="'1'"/>
  <xsl:param name="xref.with.number.and.title" select="1"/>
  <xsl:param name="insert.xref.page.number" select="'1'"/>
  <xsl:param name="variablelist.as.blocks" select="'1'"/>
  <xsl:param name="suppress.header.navigation" select="0"/>
  <xsl:param name="generate.section.toc.level" select="1"/>
  <xsl:param name="toc.section.depth" select="2"/>
  <xsl:param name="admon.graphics" select="1"></xsl:param>
  <xsl:param name="annotate.toc">0</xsl:param>
  <xsl:param name="formal.procedures" select="0"></xsl:param>
  <xsl:attribute-set name="xref.properties">
    <xsl:attribute name="text-decoration">underline</xsl:attribute>
    <xsl:attribute name="color">blue</xsl:attribute>
  </xsl:attribute-set>
  <xsl:param name="local.l10n.xml" select="document('')"/>
  <l:i18n xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0">
    <l:l10n language="en">
      <l:context name="xref-number-and-title">
        <l:template name="sect3" text="%t (Section %n)"/>
        <l:template name="section" text="%t (Section %n)"/>
        <l:template name="chapter" text="%t (Chapter %n)"/>
      </l:context>
    </l:l10n>
  </l:i18n>
  <xsl:param name="formal.title.placement">
    figure after
  </xsl:param>

  <xsl:param name="menuchoice.menu.separator">→</xsl:param>

  <xsl:param name="generate.toc">
appendix  nop
article   toc,title
book      toc,title,figure,table,example,equation
chapter   toc,title
part      nop
preface   nop
qandadiv  nop
qandaset  nop
reference toc,title
section   toc,title
set       toc
  </xsl:param>

  <xsl:param name="admon.graphics.path">../../images/</xsl:param>
  <xsl:output method="html" encoding="UTF-8" indent="no"/>
  <xsl:include href="celoxis-customizations.xsl"/>
  <xsl:param name="html.stylesheet" select="'../../style.css'"/>
  <xsl:param name="use.id.as.filename" select="'1'"/>
  <xsl:param name="section.autolabel.max.depth" select="2"></xsl:param>
  <xsl:param name="chunk.section.depth" select="'2'"/>
  <xsl:param name="chunk.first.sections" select="'2'"/>
  <xsl:param name="chunk.fast" select="'1'"/>
  <xsl:param name="chunk.quietly" select="'0'"/>

Thanks,
-- Ravi

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