As stated in bug 77753 comment 1: On Windows 7 (with the embedded fonts not installed), it will render correctly if loaded through soffice.exe but will not show correctly when opening it through the start center.
The test file - https://www.dropbox.com/s/ea429rd7qznhgum/emoji_and_symbols_test_does_not_embed_font_.odt
attachment 100224 [details] : Loading the file in LibO 4.2 through soffice.exe
attachment 100225 [details] : Loading the file in 4.2 through the Start Center
This tested in 3.6.7, 4.2.4, 4.3 beta 2, and 4.4 alpha.
jmadero messed me up and made me think i had to reopen this as another bug.
*** This bug has been marked as a duplicate of bug 77753 ***