Description:
I am a patent attorney. For years I have used Libre Office; although I keep a current copy of Microsoft Office too.  Lately I have had a problem with paragraph numbering.  The USPTO recommends numbering each paragraph using four digits between square braces, such as [0001], [0010] and so on.  To accomplish that in Libre Office, I use a number list.  Each paragraph is numbered.  For the first 9 paragraphs, the number is preceded by [000 and followed by ].  For paragraphs 10 through 99, the number is preceded by [00 and followed by ].  It has worked fine, until recently.

I save the document as a Word docx file.  I'm not sure if that has anything to do with my problem.

The problem occurs when I reopen the document in Libre Office (i.e., after the document has been saved and closed, I may reopen it for further editing).  The number formatting changes.  What was originally numbered [0001] becomes [1000], what was originally numbered [0002] becomes [2000] and so on.

Any help will be appreciated.  I'd like to get rid of Word, but cannot seem to do that.

Steps to Reproduce:
1. Create a document with 10 paragraphs.
2. Precede each paragraph with a list number.  For paragraphs 1-9, the format of the list number will be as follows:  the number will be preceded by [000 and followed by ].  For paragraph 10, the format of the list number will be as follows: the number will be preceded by [00 and followed by ].
3. Save the document as a docx document.
4. Close the document.
5. Open the document.  

Actual Results:
When the document is opened in step 5, the numbering format has changed.

Expected Results:
When the document is opened in step 5, the numbering format should not change.


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Version: 7.2.1.2 (x64) / LibreOffice Community
Build ID: 87b77fad49947c1441b67c559c339af8f3517e22
CPU threads: 4; OS: Windows 10.0 Build 19043; UI render: Skia/Vulkan; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: threaded