I am having this issue even though it is reported that it's been corrected.
I insert Fontworks, save the file, close it out, open it and the Fontwork is gone.
I am running libreOffice Version 22.214.171.124 (Build ID: 400m0(Build:2)
Saving fontwork to .doc works OK with 126.96.36.199 under Win7x64.
Assuming problems saving to odt/docx, not doc (problems with .doc in 3.x were solved in bug 51195).
Not reproducible with 188.8.131.52.beta2.
Reproducible with 184.108.40.206 - 220.127.116.11
Not reproducible with 18.104.22.168 and later.
Closing as dupe of Bug 60910. Please upgrade to a less-outdated version and try again. Please feel free to reopen this if you believe it's incorrect decision. Don't forget to leave a note why you feel so.
Thank you for reporting bugs!
*** This bug has been marked as a duplicate of bug 60910 ***
Correction: I was wrong about bug 51195, it is a RFE regarding .docx fontwork export; it is not solved until now. But all written above applies to saving fontwork to .odt files.