Legitimate duplicate text in textbox in docx is being unexpectedly removed

[xenv]

Bug

Bug was make by #1538 @AndrewTsai0406

Input (in a textbox in docx):

abcd  
abc  
abcd  <-- valid duplicate
qqq  
aaa

Output currently:

abcd
abc
qqq 
aaa

line which valid duplicate is missing

Steps to reproduce

test-textbox.docx

converter = DocumentConverter()
doc = converter.convert("test-textbox.docx").document
original_markdown_text = doc.export_to_markdown()

Docling version

2.34.0
...

Python version

3.13.3

[xenv]

I commented out this line to fix the issue I encountered. Although this approach creates quite a few blank lines :

docling/docling/backend/msword_backend.py

Line 684 in 51d3450

return

, but I'm not entirely sure why it was designed this way originally.