I’m using a Windows PC and I’m testing it between a desktop and a laptop running the most recent versions.
When I Sync Everything the browser toolbar button settings are not remembered. I have to re-right click Hide VPN, Sidebar and some other things. I believe the entire “Toolbar” settings in the options is not synced to be honsest.
Something to add to your bug list that I’m sure already existed from years ago.
The website notification settings, also, do not appear to be saved/synced. So for example, if for this community website, “I allow forever” the notifications options are not saved between desktop/laptop brave browsers.