When looking at the pacman log, I saw that the zen kernel I was using got updated as well as what I think is the nvidia drivers for the GTX 1660 I was using, so there might be a downgrade needed? I am not sure.
If you have any advice, please let me know, it would be greatly appreciated.
I saw this as well. I had to downgrade from 530 series to 525 series to get the external monitor to work (it would only refresh if the mouse was moved, it would only switch on post-boot if the mouse moved into the second monitor area). The downside is that I saw a degradation in performance for some games when going from 530 to 525 (e.g. American Truck Simulator has a rock solid 60 FPS under 530 series, but 525 sees drops to 30 FPS at points).
No - the driver series. The recent upgrades moved the nVidia drivers to 530.41.03-1. That upgrade, from 525.89, caused the performance issues on the second monitor for me. I used the downgrade tool to go back to the earlier drivers. That solved everything for me.
You may need to install the downgrade package (yay -S downgrade)