Description:
LibreOffice Draw can open a Visio 2013 file from a third-party without any significant issues (apart from minor styling issues due to non-existent colours etc).

The document can then be modified and saved as a native .odg file, but when opening that .odg file again, LibreOffice issues the following error:

Read Error.
Format error discovered in the file in sub-document content.xml at position 2,3455(row,col).

Opening the ODG file in 7-zip to extract the Content.xml file and then finding the referenced location, it's referring to the following XML:

<style:graphic-properties ="evenodd" draw:stroke="none" draw:fill="solid" draw:fill-color="#5b9bd5" draw:shadow="hidden"/>

I have attempted removing all styling from the VSDX before saving & setting everything to the default format.

Steps to Reproduce:
1.Import VSDX file (can supply if requiested)
2.Save as native ODG file
3.Open ODG file.

Actual Results:  
Error message.

Expected Results:
Open the new file.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
Version: 5.4.4.2 (x64)
Build ID: 2524958677847fb3bb44820e40380acbe820f960
CPU threads: 4; OS: Windows 6.1; UI render: default; 
Locale: en-GB (en_GB); Calc: group


User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36