One of potentially two bugs is in play here, both of which require 3rd party tools to fix (or an update from NVidia).
The original issue from last year was likely the result of MSAA in tandem with Alpha Testing. Turning off Multisample Alpha-Test in the Advanced options should fix it, or switching to a different AA technique. You can also change the alpha sampling method using something like the NVIDIA Profile Inspector and it can clear it up as well.
More recently, NVidia drivers from the Cyberpunk Game Ready driver onward are missing a setting from their WoW profile. There’s a rather lengthy discussion about it here: [Main thread] Nvidia 460.xx driver flickering