Yeah! Same issue here.
Brave Version: 1.32.106 Chromium: 96.0.4664.45 (Official Build) (64-bit)
Devices currently in use: Windows, Arco Linux, Android Phone
Issue: Only Bookmark sync is working, rest all are not syncing
I am facing the exact same thing. I created a sync chain on my Windows 10 Desktop Computer and joined the chain on my Pop!_OS 21.10 Laptop Computer and enabled “Sync Everything”. Only the bookmarks synced. I also tried manually choosing everything to sync, but still only the bookmarks. The other posts I have seen in other threads report this for Windows to Linux where only the bookmarks work.