Xiaomi released Android 10 for the Mi A3 yesterday. As is becoming a theme with Xiaomi's Android One OS updates, however, the build was extremely buggy, and the company has now chosen to pull the update entirely.
https://www.notebookcheck.net/Xiaomi-discontinues-the-Android-10-rollout-for-the-Mi-A3-after-heavy-bug-complaints.455178.0.html