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The Android 11 update for Mi A3 came with December 2020 security patch though it was rolled out in early January. Hence, the company has now released a new update that bumps up the security patch level to January 2021.
The latest system update for the Xiaomi Mi A3 comes with build number V12.0.4.0.RFQMIXM (global variant) and weighs 329MB in size. Just like any other OTA update, is it being rolled out in batches. Anyway, interested users can head over to Settings > System > Advanced > System update to check if their unit has received the update.
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That said, the changelog for the update does not mention anything. But it brings the Android 11 native screen recorder, which was missing in the previous build. It can be accessed from the edit section of quick settings.
Lastly, apart from the screen recorder, the new update also brings YouTube Music as a system app, and hence, it cannot be uninstalled.