I have the same problem as the original poster. One exception though, my external keyboard generally works fine until I use my laptop keyboard, then it acts up as well. This began after the second to last update and got worse on the last update.
To the point that I'm not able to use they keypad, or the number row on either laptop or external keyboard to put my pin in on the login screen. I have had no other new software installations, and only two software updates, that do not affect the keyboard.
I've attempted safe mode and have the exact same issues. Keyboard drivers did not change, so a rollback of them is not a fix.