I have also been getting strange framedrops. In skull canyon my fps never dropped below 70. Here theres some specific grassy fields that are dropping me to 45 fps. I've tried dropping my settings to medium but I still cant get a stable 60 in these grassy fields, and I have a 1660 super so I dont think I should be having a problem. Thing costs more than an xbox one s on its own, It should run a free to play competitive shooter game at at least 60 fps. Point being, I get 80 fps 90% of the time, but in this grass I lose frames. It sucks.
PC Specs:
Ryzen 5 2600
1660 super
16 gb 3000 mhz ram
1 tb 7200 rpm HDD