Saxon

I have the following XSLT:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	xmlns:math="http://www.w3.org/2005/xpath-functions/math" exclude-result-prefixes="xs math"
	version="3.0">
	
	<xsl:mode streamable="yes"/>
	
	<xsl:output indent="yes"/>
	
	<xsl:template match="note">
		<xsl:copy>
			<xsl:for-each-group select="*/text()" group-starting-with="text()[ends-with(., ':')]">
				<group>
					<xsl:copy-of select="snapshot(current-group())/.."/>
				</group>
			</xsl:for-each-group>
		</xsl:copy>
	</xsl:template>
	
</xsl:stylesheet>

When run with Saxon 9.7.0.4 EE against the input sample

<?xml version="1.0" encoding="UTF-8"?>
<note>
	<para>customer name :</para>
	<para>mr. Joe Someone</para>
	<para>calling from :</para>
	<para>1234567</para>
	<para>device model :</para>
	<para>ABC-123</para>
	<para>issue:</para>
	<para>some info</para>
	<para>some more info</para>
	<para>and even more info</para>
	<para>solution :</para>
	<para>some solutions</para>
	<para>and some more solutions</para>
</note>

Saxon compiles and runs the XSLT but produces the following result:

<?xml version="1.0" encoding="UTF-8"?>
<note>
   <group>
      <para>mr. Joe Someone</para>
      <para>calling from :</para>
   </group>
   <group>
      <para>1234567</para>
      <para>device model :</para>
   </group>
   <group>
      <para>ABC-123</para>
      <para>issue:</para>
   </group>
   <group>
      <para>some info</para>
      <para>some more info</para>
      <para>and even more info</para>
      <para>solution :</para>
   </group>
   <group>
      <para>some solutions</para>
      <para>and some more solutions</para>
      <para>
</para>
   </group>
</note>

So some grouping has happened but the group contents in the result groups seems rather messed up. For comparison, the same code minus the <xsl:mode streamable="yes"/> produces the wanted result:

<?xml version="1.0" encoding="UTF-8"?>
<note>
   <group>
      <para>customer name :</para>
      <para>mr. Joe Someone</para>
   </group>
   <group>
      <para>calling from :</para>
      <para>1234567</para>
   </group>
   <group>
      <para>device model :</para>
      <para>ABC-123</para>
   </group>
   <group>
      <para>issue:</para>
      <para>some info</para>
      <para>some more info</para>
      <para>and even more info</para>
   </group>
   <group>
      <para>solution :</para>
      <para>some solutions</para>
      <para>and some more solutions</para>
   </group>
</note>

This is also the result I get with Exselt for both versions of the XSLT (with <xsl:mode streamable="yes"/> and without it).