Here's everything I've got at "START, Settings, Update & Security, View Update History, Uninstall Updates"...

(a) KB5000736: Feature update to 21H1. There is no preview for that.
(b) Servicing Stack 10.0.19041.1022: One comes in automatically with every update to facilitate it.
(c) KB5003254: Cumulative Update Preview for.NET Framework 3.5 and 4.8 for Windows 10.
(d) KB5003214: (OS Builds 19041.1023, 19042.1023, and 19043.1023) Preview.
My OS Build (at right-click START, System) is 19043.1023 because I took the preview. Yours must be ...985 because that was the last "stable" one released. The stable ones are actually the finalized quality update that normally is released on the 2nd Tuesday of each month. It is called a "B" release. That's when you'll become ...1023 -- in June. The previews are called "C" & "D" releases because they are normally released on the 3rd & 4th Tuesdays/or so of the month. That is how I read it from the site Sumit posted. Here you can see the history of 21H1 updates & which are previews...
https://support.microsoft.com/en-us/topic/windows-10-update-history-1b6aac92-bf01-42b5-b158-f80c6d93eb11
Windows 10 update history