Description:
When I convert table to text using menu Table - Convert - Table to text (with
separate text at paragraph), then paragraph alignment is lost, while other
formatting like indents and spacing is preserved. 
When you convert text to table using the same options, paragraph alignment is
preserved in the table, but when you convert it back to text, you will get all
paragraphs left aligned.

Steps to Reproduce:
1. Create Writer document
2. Put few paragraphs of text
3. Select all the text
4. Choose menu Table - Convert - Text to Table (with separate text at paragraph)
and press OK
5. Make some paragraphs in the table aligned left, some right, some centered and
some justified.
6. Choose menu Table - Convert - Table to text (with separate text at
paragraph)and press OK

The whole text you will get will have left alignment. Other formatting, like
fonts, indents and spacing will be preserved.

I couldn't find any workaround.