all good on Mi 9T with new weekly 21.01.13 - thanks' devs !
download OK from AFH (surprisingly fast !). MD5 check OK. dirty flash w/o any issues.
wiped cache + dalvik only; no need to delete /data/system/package_cache as it was already empty...
first boot quite long ~5'
no bugs so far. fast and responsive. kept all my settings - so well done !