I've been told that opensuse tumbleweed has it. I've also read a suse forum post saying leap 16 will support offline updates, releasing in January, so they could be the first to support all of this with fs snapshots
Even just the updating from Discover can be broken on some systems
if you didn't enable offline updates in systemsettings, then it'll do roughly the same as you would in the terminal, so that's not unexpected