Xiaomi began sending out the Android 12 beta update to Global ROM units for the first time a few days ago. The rollout started with the Mi 11, Mi 11i, and Mi 11 Ultra but it appears, in typical Xiaomi fashion, that said update could have some major issues.
https://www.notebookcheck.net/Android-12-Global-stable-beta-for-the-Mi-11-series-may-be-bricking-phones.569450.0.html