Thank God none so far , what issue you ran into? I'm on Android 11 now .
Several apps would constantly crash, including Signal and that is my primary SMS app so that was really frustrating.
The Fingerprint reader worked less than half the time. To the point that I would often get enough misses that I would have to put in mu pin.
Half the time Spotify would not be accessible in Android Auto.
The home screen icons would sometime just not be there and I would have to scroll a page over and then back for them to load (Using OnePlus Launcher)
Wen I would leave an area with Wifi it would take sometimes as long as 5 minutes before I had carrier network access (Fi may have been to blame for this)
I had issues with calls as well. I had to set my phone to 2g/3g only if I wanted to take or receive calls. I was on Google Fi, but having said that I had previously had an unlocked 7t Pro Mclaren that I dropped and shattered and I had none of these issues.
I have the 9 Pro Unlocked direct from OP (NA Version) and so far not one issue.