[Python] Preserve line breaks in XML attributes when parsing with lxml

I'm trying to batch-process a couple of XML files through a python script, with the XML files having line breaks in some of their attributes like so:

<?xml version='1.0' encoding='UTF-8'?>
<xml>
<test value="This is
a test

with line breaks
"/>
</xml>


However, I noticed that line breaks within attributes are removed when parsing this file. For example, the following script:

import lxml.etree as ET

with open("input.xml", "r", encoding="utf-8") as f:
source = ET.parse(f)
root = source.getroot()
dest = ET.ElementTree(root)
dest.write("output.xml", encoding="utf-8", xml_declaration=True)


would produce the following output file:

<?xml version='1.0' encoding='UTF-8'?>
<xml>
<test value="This is a test with line breaks "/>
</xml>


While this seems to be in line with W3Cs recommendations as per this related answer, is there a way to use xml.etree or lxml.etree for modifying the XML file without removing those line breaks?

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