Filtering output of XML file does not return line breaks while JSON does

[mgutt]

XML Input

<POSTER_LIST>
 <GROUP NUMBER="1">
  <POSTER>front.pdf</POSTER>
  <POSTER>back.pdf</POSTER>
 </GROUP>
 <GROUP NUMBER="2">
  <POSTER>front.pdf</POSTER>
  <POSTER>back.pdf</POSTER>
 </GROUP>
</POSTER_LIST>

Does not return line breaks:

# yq '.POSTER_LIST.GROUP[].POSTER[]' file.xml
front.pdfback.pdffront.pdfback.pdf

While using the same filter for a json file does:

# yq -oj file.xml | yq '.POSTER_LIST.GROUP[].POSTER[]'
front.pdf
back.pdf
front.pdf
back.pdf

Version:

 # yq -V
yq (https://github.com/mikefarah/yq/) version v4.44.3