the copy() method seems to add an CR/LF onto the copied value.

To reproduce this behavior just start your office with parameter

"-accept=socket,host=0,port=8100;urp;" 

and call inside a solar shell:

checkapi -o
sw.SwAccessibleParagraphView::com::sun::star::accessibility::XAccessibleText

In the output you will see:
...
LOG> Text is 'XAccessibleText'
############################
...
copyText(0,chCount):true
LOG> Clipboard: 'XAccessibleText
'
copyText(1,chCount-1):true
LOG> Clipboard: 'AccessibleTex
'

The "true" means that copy() returns with valid content, bur the "LOG>..." shows
that XAccessibleText is not captured between apostrophe, there is a CR/LF.