This is a known issue that our team is actively investigating. Deleted agent sessions and chats come back due to a bug in local state management — stale state overwrites the deletion on startup. It affects users across all platforms.
Unfortunately, there’s no reliable workaround at the moment — manually clearing caches or local storage doesn’t resolve it.
You can follow the main thread tracking this issue here: Deleted past chats will appear again after the new recent update
The diagnostic data you shared about the state.vscdb entries is helpful — thank you for taking the time to dig into that.