I suspect there's some inherent incompatibility that isn't guaranteed to show up for everyone if the circumstances are right.
In my case, before the anniversary update, I was always having the problem where i would have to disconnect and reconnect the keyboard and then the sensor would MOSTLY work; not always.
Then after the anniversary update, it seems it just flat out stopped working altogether.
If i had thought about it sooner, i would have just tried to roll back the driver to see if it solved the problem. Unfortunately, i didn't think of that right away and ended up doing a full system rebuild, which didn't solve the problem, and then it donned
on me to do the driver rollback.
Thus far, it's been working perfectly since doing that. Fingerprint scans every time - no disconnect/reconnects or anything.
I think the other change i did make was to go into the driver settings and disable that "let the system put this to sleep" option. I have to double check if i did that or not.