Yep. Brave Sync has been broken on iOS for months now. I do hope someone actually reads these posts. Cause replicating this is dead easy. I’ve already experienced 3 different iPadOS updates and none of them fixed it.
How to replicate the sync issue? Just install brave on iPadOS, latest official version. Set your settings. Go to Sync. Join an existing chain. Enter the code phrase. Boom, you joined, everything works perfectly. Come back in a few days. You realise you’re out of sync. Try to fix it by going to Sync again from the menu. Brave crashes. You open it again, boom. It prompts you to either join a sync chain or create a new one. So, the device has dropped out of the sync chain. P.s. other devices on that sync chain include a Windows device, a Macbook Pro one and an Android.
Those were the exact same steps to replicate the issue for months now.