Version: plasma-desktop 5.2.2-1
version dolphin: kdebase-dolphin 14.12.3-1, kdesdk-dolphin-plugins 14.12.3-1
1) add new entry in places
2) restart dolphin and the changes are not saved
Thanks for the bug report!
This problem has been reported already, I'll mark it as a duplicate.
*** This bug has been marked as a duplicate of bug 345174 ***