Description:
Changing page style working after saving the filee

Steps to Reproduce:
1. Open Writer
2. CTRL+ENTER
3. Format -> Paragraph -> Text flow -> With Page style & set it to Landscape
4. Press OK
5. Press CTRL+Enter twice (adding 2 empty pages) So 3 Landscape
6. Place cursor on page 3
7. Format -> Paragraph -> Text flow -> With Page style & set it to Default 
8. Press OK (next page changes, not to current page.. not sure if this proper.. but not point here)
9. CTRL+Z
10. Save file As ODT with a file name
11. File Reload
12. Repeat 6-7 -> Nothing

Actual Results:
Nothing happens

Expected Results:
Should happen something


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.1.0.0.alpha0+ (x64)
Build ID: <buildversion>
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: ru-RU (nl_NL); UI: en-US
Calc: CL