Description:
When in an LO Writer table with text-content in the cells the layout is changed from 'standard' to 'academic', the text data will be replaced wit '0' after saving and closing the document.
When text content is writen to an cell AFTER the layout is changed to academic, nothing will happen when closing the document.
When the document is open with MS Word 2016 the text data will shown in the correct way.
(I am not sure if the name of the layout in the english version of LO is also academic, when using the german GUI it is called "Akademisch". On these machine I can't change the language because I am no admin and only german GUI is installed, sorry.)

Steps to Reproduce:
1. Greating a table in standard layout an fill with text content.
2. Save the document.
3. Change the table layout from standard to academic.
4. Save and close the document.
5. Open the document again. -> Text will be replaced by '0'.
6. Open the document with MS Word. -> Text will be shown correkt.
7. Open the document in LO again, change an cell that show '0' to some text. Save and close the document.
8. Open the document. The in step 7 changed cell will shown correct.

Actual Results:
Text data in the table is replaced by '0'

Expected Results:
1. Academic layout should not change the data/text in cells.
or
2. The layout should be renamed (for example to math) and the change of the cell content should happen dirrectly when the layout is changed. Not after saving and closing. Because after closing the data is more or less lost!


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 6.4.1.2 (x64)
Build-ID: 4d224e95b98b138af42a64d84056446d09082932
CPU-Threads: 6; BS: Windows 10.0 Build 18363; UI-Render: Standard; VCL: win; 
Gebietsschema: de-DE (de_DE); UI-Sprache: de-DE
Calc: CL