Samsung has released new software updates for the Galaxy Watch Active2 (SM-R820) and Galaxy Watch3 (SM-R840). Both are based on Tizen 18.104.22.168, but the update for the Watch Active2 comes with build number R820XXU1DUD1, while the firmware for the Watch3 has version R840XXU1BUD2.
Samsung Galaxy Watch3
The build for the Watch3 includes system reliability improvements, while the Watch Active2 also gets improvements to Wi-Fi and Messaging App stability.
You can download the new updates through the Galaxy Wearable app.