Re-/Opening a saved window from an unnamed/un-saved window results in duplicate tabs in saved window

quirk

I wake up / unsuspend my Mac. I launch Orion
I have a un-named/un-saved window with just a start page tab
I open a saved window named 'Finance'. Last time I closed this saved window, there were multiple tabs open, but all tabs had unique URLs.
The newly opened (or restored) saved window 'Finance' opens, but with 3 tabs per URL. i.e. now there are thrice the amount of tabs as previously open and each tab has two extra duplicate tabs next to it.

In the attached image, I have closed all the duplicate tabs (before I file this bug report), except the 'Feed / Produ...' tabs which are triple duplicates of what used to be just one tab. Before I closed the duplicate tabs, I had three duplicate tabs per URL.

When I open / restore a saved window, it should restore my saved tabs correctly:

The tabs should be in the order that I last left them in that saved window
The tabs should be the same number as I last left them in the saved window
The tabs should be the same URLs as I last left them in the saved window (except in cases where a load of a URL after restore / unsuspend causes a redirection - perhaps for authn/authz?)

Version 0.99.133-beta (WebKit 621.1.2.111.4)

Sequoia (15)

quirk

Can confirm still a bug in Version 0.99.134-beta. It has evolved slightly:

Now only some tabs in the saved window are duplicated on restore.
Tabs that were closed soon before closing a saved window still show up on restore.

This looks like a clear sync issue (I believe Orion syncs to iCloud cloudkit containers). Perhaps have timestamp based sync merging mechanisms, so that local changes which are yet un-synced take precedence.