Trees and Bushes Displayed as 2D Billboards in Almost Every World

praisethebastii​  The processor does come with a Vega 8 graphics chip, but I was wondering whether you had a discrete card in there as well.  The GTX 960 is a decade old but still much faster than the Vega 8, not that the latter is incapable of running Sims 4.  Still, it's a significant downgrade in terms of gaming performance even if the system is probably noticeably faster in everyday use.

I really don't know what's going on here.  I would suggest trying deleting the folders for another expansion, just to see what happens, for example maybe the Horse Ranch world is more sensitive than others.  (In another case of this, that world was the only one affected, so it's possible.)  The repair replaces the folder in Delta, and then you'd redownload the pack itself.  And I'd try playing in a clean boot again immediately afterwards, with your antivirus disabled, to be as thorough as possible.  As long as you don't do anything else at the same time, your computer should be safe, and then you can reenable the AV when you're done.

If that doesn't help, my only other suggestions for the moment would be to try an older graphics driver and to clean-uninstall and reinstall the game.  For older drivers, you'd need to use Display Driver Uninstaller to remove your current version, as described here:

https://crinrict.com/blog/2019/02/clean-re-install-of-graphics-drivers-with-display-driver-uninstaller-ddu.html

You can find older drivers here:

https://www.amd.com/en/support/downloads/previous-drivers.html/processors/ryzen/ryzen-5000-series/amd-ryzen-7-5700g.html

I wrote out how to clean-uninstall the game in the accepted solution of this thread, which is for a different issue, but the process is the same:

[CURRENT ISSUE] Sims 4 DLC shows as installed, won't load in-game | EA Forums - 11831673

If none of this helps, let me know, and I'll ask someone else to take a look, as a second opinion.