QXmlQuery xsl:variable in xsl:for-each wrong value

There exists a problem in the xslt-transformation with xsl:variable in xsl:for-each loops

If you use a xsl:variable defined in an xsl:for-each only ONE time within the xsl:for-each it stores the correct value, if you use the variable multiple times it is always set to the value it gets in the first iteration of the xsl:for-each

Example:

a)

<xsl:template match="/Module">
  <xsl:for-each select="Data">
    <xsl:variable name="Entry" select="@entry"/> 
    <xsl:value-of select="concat('value: ', $Entry, '&#x000A;')"/>
  </xsl:for-each>
</xsl:template

would output the expected value of the data for each iteration

b)

<xsl:template match="/Module">
  <xsl:for-each select="Data">
    <xsl:for-each select="Data"> 
      <xsl:variable name="Entry" select="@entry"/>
      <xsl:value-of select="concat('value: ', $Entry, '&#x000A;')"/>
      <xsl:value-of select="concat('value: ', $Entry, '&#x000A;')"/>  
  </xsl:for-each>
</xsl:template>

would output only the first iterations value of the variable

Following example data:

<Module>
 <Data entry="1"/>
 <Data entry="2"/>
 <Data entry="3"/>
</Module>

Output with QT5.12.2:

a)

value: 1
value: 2
value: 3

b)

value: 1
value: 1
value: 1
value: 1
value: 1
value: 1

while the correct output for b) should be

value: 1
value: 1
value: 2
value: 2
value: 3
value: 3

I attached a sample xml , xslt and source that does a transformation. (simply adjust the path to the files)

The output for the transformation with saxon, xalan and QT4.8.6 produces the correct result.