Chunking does not work when using xsd

[TiboGr]

Expected Behavior

Output files are produced depending on chunk attributes

Actual Behavior

The transformation always outputs one file for each topic

Steps to Reproduce

1. define the following map with its topics :

<?xml version="1.0" encoding="UTF-8"?>
<map xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:oasis:names:tc:dita:xsd:map.xsd:1.3">
    <title>Map 1</title>
    <topicref href="topic.dita" chunk="to-content">
        <topicref href="topic2.dita"/>
    </topicref>
</map>

2. run the transformation dita -i map.ditamap -o out -f dita
3. There should be one output containing both topic and topic2 but there is topic.dita and topic2.dita

Note: using dtd instead of xsd works fine

Environment

• DITA-OT version: 4.2.2
• Operating system and version: Windows 11
• How did you run DITA-OT? dita command
• Transformation type: HTML5, dita