The v4.0 Hotfix 2 was primarily designed to improve overall stability and performance on PC. It specifically addressed game crashes, particularly those related to Nvidia DLSS 3 Frame Generation , which was unstable at the initial release. Major Improvements:
Changing TextureMipBias from -1 to 0 in the game's .ini files to improve texture clarity. File: The.Witcher.3.Wild.Hunt.v4.0.Hotfix.2.Inc...
If you are looking for specific patch notes or troubleshooting for this version, The v4