I haven't a clue what reporter is talking about

@Jiero 
Please be more precise! What's your problem?
a) You can not select a particular page you want to export
b) You can not export selection on page, always whole page will be
   exported.

Sorry, I missed an important step.

Check "Embed OpenDocument file Makes this PDF easily editable in LibreOffice"

Reproduce steps:
 1. File > Export to PDF
 2. Initial View tab > Page layout > select Single page
 3. Export

Result: A PDF with the expected content inside but the page layout is "Default"
Expected result: A PDF with the expected content on a "single page"

Tested on: Windows 7 x64 and MacOS

Note: As I remember, this bug does not appear in 4.0.1.2

> Check "Embed OpenDocument file Makes this PDF easily editable in LibreOffice"
Doing that makes 'Range' part on the left side greyed out so we can't select page(s).

@Daniel, 
I think your steps is a different problem. Perhaps you should open new bug report & attach your sample. Anyway I can't reproduce, choosing Default nor Single page doesn't make any difference.

Confirmed with LO 4.0.4.2 (Win7 32bit)

Sorry I forgot the steps:
1. Menu File: Export as PDF
2. Check mark 'Embed OpenDocument file' under "General" on the right side
3. See that all selection under "Range" on the left side greyed out

+Modify Summary to fit reporter's description

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It is clearly by design. It has been judged inconsistent to embed the entire document in odt format and to export only a part of the same document in pdf.
If you first choose under "Range" the pages you want to be exported then check "Hybrid PDF (embed ODF file)", the range goes back to All before to be grayed.

Embedding the ODF file means that when you open the hybrid pdf in LibreOffice, it opens the ODF file instead importing the pdf. It would be inconsistent to have different behaviors when you open the same pdf in your favorite pdf viewer and in LibreOffice.

Closing as NotABug.

Best regards. JBF