It looks like there weren't any huge issues with it, because now the stable update to Pie is rolling out to some Mi A2 Lite units in the wild. XDA Developers reports that one user in Poland has shared screenshots proving he got the update, and you can see these below.
The Android 9 Pie update for the Mi A2 Lite comes as a 1GB download, and brings with it FM radio functionality, adaptive battery and brightness, as well as recommended apps and actions based on your context. Of course since this is Android One you can also expect all the other improvements that Google announced to be baked in. Additionally, you're getting the November 5, 2018 security patch level.
It's unclear at the moment if the update is going out in every market where the Mi A2 Lite is offered, but even if it isn't we assume it's only a matter of time before it reaches every single unit out there.
Now downloading pie update in Malaysia!
When the update of Android pie in the Philippines?
i experience following issues after update: camera App cannot open while DND mode on Audio Quality is bad in voice call,music play etc No notification lights while charging..